Geometrical Optics – 100 Higher-Order Thinking (HOTS) MCQs with Explanations | Competitive Exam Preparation
50 Higher-Order Thinking Skills (HOTS) MCQs (Level 3) on Geometrical Optics, Physics (Unit-Wise MCQs Practice):
Whether you are preparing for board examinations, chapter tests, college assessments, or competitive entrance exams (MDCAT, ECAT, NUST, PIEAS, GIKI, UET, FAST, and other engineering or medical admission tests), this comprehensive MCQ collection is designed to help you master Unit 16 – Geometrical Optics. The questions progress from basic concepts to advanced numerical problems and higher-order thinking skills, ensuring complete and systematic exam preparation.
This chapter-wise MCQ collection includes:
- 100 Basic MCQs Level -1 (1 - 100) Reflection, refraction, mirrors, lenses, prisms, refractive index, optical instruments, and vision defects.
- 100 Advanced & Numerical MCQs (101 -200): Mirror and lens formulae, magnification, lens power, Snell's law, prism calculations, critical angle, total internal reflection, and numerical applications.
- 50 Higher-Order Thinking Skills (HOTS) MCQs 201 - 250): Analytical reasoning, conceptual understanding, Board-inspired questions, practical applications, and competitive exam-level problems.
- 50 Challenging MCQs Quiz with Answers: A carefully selected mix of conceptual, numerical, and HOTS questions for quick revision, self-assessment, and complete exam preparation.
Key Topics Covered
- Reflection and refraction of light
- Plane, concave, and convex mirrors
- Convex and concave lenses
- Mirror and lens formulae
- Magnification and lens power
- Refractive index and Snell's law
- Apparent depth, prisms, and dispersion
- Critical angle and total internal reflection
- Optical fibres and optical instruments
- Human eye and common vision defects
Every MCQ includes the correct answer with a clear concept-based explanation to strengthen understanding, improve problem-solving skills, and build confidence in objective-type questions.
With 250 carefully selected MCQs arranged into 100 Basic, 100 Advanced & Numerical, and 50 HOTS questions, plus a 50-question Challenging MCQs Quiz, this all-in-one question bank provides complete preparation for Unit 16 – Geometrical Optics and helps students excel in both board examinations and competitive entrance tests.
Best Budget Laptops for Students for Study, Coding & Office Work
(2026 Amazon Deals)
Geometrical Optics MCQs Level 3 – 50 Higher-Order Thinking (HOTS)MCQs (201–250)
MCQ No. 201
A student observes that the image formed by a concave mirror changes from real to virtual as the object is moved toward the mirror. This change occurs because the object has crossed the:
a. Center of curvature
b. Principal axis
c. Principal focus
d. Pole
Correct answer: c
Explanation: A concave mirror forms real images when the object is beyond the principal focus. Once the object moves between the pole and the focus, the reflected rays diverge, producing a virtual, erect, and magnified image.
MCQ No. 202
Two students stand at different distances from the same plane mirror. One claims that the person standing farther away requires a larger mirror to see the full image. Which statement is correct?
a. The first student is correct.
b. The required mirror size increases with distance.
c. Both students are correct.
d. The required mirror height remains the same regardless of distance.
Correct answer: d
Explanation: The minimum height of a plane mirror required to see the entire body is always half the person's height and does not depend on the distance from the mirror.
MCQ No. 203
A driver replaces a damaged rear-view mirror with a concave mirror. What is the most likely consequence?
a. A wider field of view is obtained.
b. Objects always appear smaller.
c. Nearby vehicles appear enlarged, but the field of view decreases.
d. There is no noticeable difference.
Correct answer: c
Explanation: Concave mirrors provide magnification for nearby objects but cover a smaller area. Rear-view mirrors are convex because they offer a much wider field of view.
MCQ No. 204
A beam of parallel light falls on a concave mirror. If the mirror is cut into two equal halves, each half will have:
a. Double the focal length
b. Half the focal length
c. The same focal length as the original mirror
d. No principal focus
Correct answer: c
Explanation: The focal length depends on the radius of curvature of the spherical surface, which remains unchanged even if the mirror is divided. Only the brightness of the image decreases.
MCQ No. 205
An object is gradually moved away from a convex mirror. The image formed will:
a. Increase in size.
b. Become real.
c. Move closer to the principal focus behind the mirror while becoming smaller.
d. Move farther behind the mirror indefinitely.
Correct answer: c
Explanation: A convex mirror always forms a virtual image between the pole and the focus. As the object moves farther away, the image approaches the focus and becomes more diminished.
MCQ No. 206
A ray enters a glass slab normally and another enters at an angle. Which ray experiences lateral displacement?
a. Only the normally incident ray
b. Both rays equally
c. Only the obliquely incident ray
d. Neither ray
Correct answer: c
Explanation: A ray entering normally passes straight through without deviation, whereas an oblique ray undergoes refraction and emerges laterally displaced.
MCQ No. 207
A diver underwater looks upward toward the water surface. Beyond a certain angle, the surface behaves like a mirror. This phenomenon is due to:
a. Diffraction
b. Total internal reflection
c. Dispersion
d. Polarization
Correct answer: b
Explanation: When light inside water strikes the surface at an angle greater than the critical angle, total internal reflection occurs, making the surface appear mirror-like.
MCQ No. 208
Two transparent materials have the same refractive index. Which statement is correct?
a. Light travels at different speeds in the two materials.
b. Light travels at the same speed in both materials.
c. Their densities must also be the same.
d. They must be made of the same substance.
Correct answer: b
Explanation: Since refractive index is defined by , equal refractive indices imply equal speeds of light, although the materials themselves may differ.
MCQ No. 209
A student observes that violet light bends more than red light in a prism. The best explanation is that:
a. Violet light travels faster in glass.
b. Violet light has a higher refractive index in glass than red light.
c. Red light has a higher frequency.
d. Violet light has lower energy.
Correct answer: b
Explanation: Glass has a higher refractive index for shorter wavelengths. Therefore, violet light undergoes greater refraction and deviation than red light.
MCQ No. 210
A ray of light travels from water into air. As the angle of incidence increases, the angle of refraction eventually reaches 90°. This angle of incidence is called the:
a. Angle of deviation
b. Polarizing angle
c. Critical angle
d. Brewster angle
Correct answer: c
Explanation: The critical angle is the angle of incidence in the denser medium for which the angle of refraction becomes exactly 90°.
MCQ No. 211
Why is an optical fibre bent into curves without allowing light to escape?
a. Light continuously refracts into air.
b. Continuous total internal reflection keeps light inside the fibre.
c. The fibre absorbs all incident light.
d. Reflection occurs only at the ends of the fibre.
Correct answer: b
Explanation: Light repeatedly undergoes total internal reflection at the core-cladding boundary, allowing it to follow curved paths with minimal energy loss.
MCQ No. 212
A convex lens and a concave lens have equal focal lengths in magnitude. Which statement is correct?
a. Both have the same power.
b. The convex lens has positive power, while the concave lens has negative power of equal magnitude.
c. Both always produce real images.
d. Both always produce virtual images.
Correct answer: b
Explanation: Lens power is . A convex lens has positive focal length, whereas a concave lens has negative focal length.
MCQ No. 213
A student measures the apparent depth of a coin in water instead of its real depth. The calculated refractive index will be correct only if the student also knows:
a. The wavelength of light
b. The real depth of the coin
c. The intensity of light
d. The angle of incidence
Correct answer: b
Explanation: The refractive index is given by:
Both quantities are required.
MCQ No. 214
An astronomer prefers a reflecting telescope over a refracting telescope mainly because reflecting telescopes:
a. Use no mirrors.
b. Eliminate chromatic aberration.
c. Cannot collect large amounts of light.
d. Produce virtual images only.
Correct answer: b
Explanation: Mirrors reflect all wavelengths equally, so reflecting telescopes do not suffer from chromatic aberration.
MCQ No. 215
Which property makes diamonds sparkle much more than ordinary glass?
a. Lower refractive index
b. Greater transparency only
c. Very small critical angle causing repeated total internal reflection
d. High electrical conductivity
Correct answer: c
Explanation: Diamond has a very high refractive index, producing a small critical angle and multiple total internal reflections inside the crystal.
MCQ No. 216
If the speed of light were the same in all transparent media, which phenomenon would disappear?
a. Reflection
b. Refraction
c. Shadows
d. Image formation by mirrors
Correct answer: b
Explanation: Refraction occurs because light changes speed when entering another medium. If the speed remained the same, no bending would occur.
MCQ No. 217
A person wearing spectacles for myopia accidentally uses spectacles meant for a hypermetropic person. The most likely result is that:
a. Distant vision improves.
b. Nearby objects become clearer.
c. Distant objects appear even more blurred.
d. Both near and distant vision become perfect.
Correct answer: c
Explanation: Myopia requires concave lenses. Using convex lenses instead shifts the image farther behind the retina, worsening distant vision.
MCQ No. 218
Which statement best explains why a convex mirror is safer than a plane mirror for vehicle side mirrors?
a. It forms magnified images.
b. It provides a larger field of view while producing erect images.
c. It forms real images.
d. It increases image brightness.
Correct answer: b
Explanation: A convex mirror allows the driver to observe a much wider area behind the vehicle, reducing blind spots.
MCQ No. 219
A student claims that increasing the refractive index of a lens always increases its power, provided its shape remains unchanged. This statement is:
a. Always true
b. Always false
c. True because lens power depends on refractive index as well as curvature
d. True only for concave lenses
Correct answer: c
Explanation: According to the lens maker's formula, increasing the refractive index increases the lens power if the radii of curvature remain constant.
MCQ No. 220
During an experiment, a prism is replaced by a rectangular glass slab. Which phenomenon will no longer be observed?
a. Refraction
b. Lateral displacement
c. Dispersion into a visible spectrum
d. Change in speed of light
Correct answer: c
Explanation: A rectangular glass slab has parallel faces, so the colours recombine upon emergence. A prism has non-parallel faces, allowing the colours to separate.
MCQ No. 226
A student places an object exactly at the principal focus of a convex lens. During the practical examination, no image is obtained on the screen. What is the correct explanation?
a. The lens is defective.
b. The image is formed at the optical center.
c. The refracted rays become parallel and the image is formed at infinity.
d. The object is too small.
Correct answer: c
Explanation: This is a common Board practical question. When an object is placed at the principal focus of a convex lens, the emerging rays become parallel, so the image is formed at infinity and cannot be obtained on a nearby screen.
MCQ No. 227
During a laboratory experiment, a student measures the focal length of a concave mirror using sunlight. Why is this method successful?
a. Sunlight forms a virtual image.
b. The Sun is effectively at infinity, so incoming rays are nearly parallel.
c. Sunlight has a higher intensity.
d. Concave mirrors only work with sunlight.
Correct answer: b
Explanation: Since the Sun is extremely far from Earth, the incident rays are nearly parallel. A concave mirror focuses these rays at its principal focus, allowing the focal length to be measured directly.
MCQ No. 228
A Board practical asks why a convex mirror is preferred as a vehicle rear-view mirror. Which reason is the most appropriate?
a. It produces magnified images.
b. It forms real images.
c. It provides a wide field of view while producing erect images.
d. It reflects more light.
Correct answer: c
Explanation: Convex mirrors always produce virtual, erect, and diminished images, allowing drivers to observe a much larger area behind the vehicle.
MCQ No. 229
A student observes that a coin at the bottom of a beaker filled with water appears raised. Which statement best explains this observation?
a. Reflection from water.
b. Refraction at the water-air interface.
c. Total internal reflection.
d. Diffraction of light.
Correct answer: b
Explanation: As light travels from water to air, it bends away from the normal, making the coin appear closer to the surface.
MCQ No. 230
A prism is replaced with a rectangular glass slab during an experiment. Which observation remains unchanged?
a. Dispersion of white light.
b. Net angular deviation.
c. Refraction of light.
d. Formation of the spectrum.
Correct answer: c
Explanation: Both a prism and a glass slab refract light. However, only the prism produces permanent angular deviation and dispersion.
MCQ No. 231
A student accidentally interchanges the objective and eyepiece of a compound microscope. The instrument will:
a. Work normally.
b. Produce better magnification.
c. Not produce a properly magnified image.
d. Become a telescope.
Correct answer: c
Explanation: The objective and eyepiece are designed with different focal lengths. Interchanging them significantly reduces image quality and magnification.
MCQ No. 232
During a practical examination, the teacher asks why a reflecting telescope is preferred for astronomical observations. The best answer is:
a. It is lighter only.
b. It completely eliminates chromatic aberration.
c. It uses a convex mirror.
d. It produces virtual images only.
Correct answer: b
Explanation: Since mirrors reflect all wavelengths equally, reflecting telescopes are free from chromatic aberration.
MCQ No. 233
A student observes a rainbow after rainfall. Which optical phenomenon is mainly responsible for separating sunlight into different colours?
a. Reflection only
b. Diffraction
c. Dispersion after refraction
d. Polarization
Correct answer: c
Explanation: Water droplets act like tiny prisms. Sunlight is refracted, dispersed into its constituent colours, internally reflected, and refracted again before reaching the observer.
MCQ No. 234
Which observation would indicate that total internal reflection is taking place?
a. The refracted ray makes an angle of 90° with the normal.
b. No refracted ray emerges into the second medium.
c. The reflected ray disappears.
d. Both reflected and refracted rays have equal intensity.
Correct answer: b
Explanation: During total internal reflection, all the light is reflected back into the denser medium, and no refracted ray is produced.
MCQ No. 235
A student measures the apparent depth of water instead of the real depth while calculating the refractive index. The calculated value will be:
a. Greater than the actual value.
b. Smaller than the actual value.
c. Exactly correct.
d. Zero.
Correct answer: b
Explanation: Since the apparent depth is always smaller than the real depth, using it incorrectly in the calculation leads to an underestimated refractive index.
MCQ No. 236
Two convex lenses of equal focal length are placed in contact. Compared with a single lens, the combination will have:
a. Half the focal length and double the power.
b. Double the focal length.
c. The same power.
d. Zero power.
Correct answer: a
Explanation: Lens powers add directly. Doubling the power halves the equivalent focal length.
MCQ No. 237
If the refractive index of every transparent material suddenly became 1, which optical device would still function correctly?
a. Convex lens
b. Prism
c. Plane mirror
d. Optical fibre
Correct answer: c
Explanation: Refraction-based devices would stop functioning because there would be no bending of light. A plane mirror would still reflect light according to the law of reflection.
MCQ No. 238
An astronaut performs a refraction experiment in space using two transparent media. The results are essentially the same as on Earth because refraction depends primarily on:
a. Gravity
b. Atmospheric pressure
c. Difference in refractive indices
d. Earth's magnetic field
Correct answer: c
Explanation: Refraction depends on the optical properties of the media rather than gravity or atmospheric conditions.
MCQ No. 239
Which change would increase the critical angle between two media?
a. Increasing the refractive index of the denser medium.
b. Decreasing the refractive index of the denser medium.
c. Increasing the wavelength only.
d. Increasing the intensity of light.
Correct answer: b
Explanation: Since , decreasing the refractive index of the denser medium increases the critical angle.
MCQ No. 240
A convex lens and a concave mirror have the same focal length. An object is placed beyond twice the focal length from each. Which statement is correct?
a. Both form real, inverted, and diminished images.
b. Both form virtual images.
c. The lens forms a virtual image while the mirror forms a real image.
d. The mirror forms an erect image.
Correct answer: a
Explanation: Under these conditions, both optical devices produce real, inverted, and diminished images.
MCQ No. 241
A student observes that increasing the refractive index of the lens material while keeping its shape unchanged increases its power. This occurs because:
a. The lens becomes thicker.
b. Light bends more strongly at the lens surfaces.
c. The focal length becomes infinite.
d. The wavelength remains constant.
Correct answer: b
Explanation: A higher refractive index increases the bending of light, reducing the focal length and increasing lens power.
MCQ No. 242
Which property of optical fibres makes them ideal for modern communication systems?
a. High electrical conductivity
b. Low density
c. Very low signal loss due to repeated total internal reflection
d. High thermal conductivity
Correct answer: c
Explanation: Optical fibres transmit light efficiently over long distances because repeated total internal reflection minimizes energy loss.
MCQ No. 243
If red light and violet light enter the same glass prism at the same angle, which statement is correct?
a. Both emerge with identical deviation.
b. Violet light deviates more because glass has a higher refractive index for shorter wavelengths.
c. Red light deviates more because it has greater energy.
d. Red light travels more slowly in glass.
Correct answer: b
Explanation: The refractive index of glass is higher for violet light, so it bends more than red light.
MCQ No. 244
A student wants maximum magnification using a simple microscope. Which lens should be selected?
a. Long focal length convex lens
b. Short focal length convex lens
c. Long focal length concave lens
d. Plane glass plate
Correct answer: b
Explanation: The magnifying power of a simple microscope increases as the focal length decreases.
MCQ No. 245
A reflecting telescope can be made much larger than a refracting telescope mainly because:
a. Mirrors absorb less light.
b. Large mirrors are easier to support than large lenses.
c. Mirrors have zero focal length.
d. Mirrors produce erect images.
Correct answer: b
Explanation: Large mirrors can be supported from the back, making the construction of very large telescopes practical.
Mixed Analytical HOTS MCQs
MCQ No. 246
Which optical phenomenon explains both the operation of optical fibres and the sparkle of diamonds?
a. Reflection
b. Diffraction
c. Total internal reflection
d. Polarization
Correct answer: c
Explanation: Both rely on repeated total internal reflection to confine light within the material.
MCQ No. 247
If the speed of light in a medium decreases while its frequency remains constant, the wavelength:
a. Increases.
b. Remains unchanged.
c. Decreases.
d. Becomes zero.
Correct answer: c
Explanation: Since , a decrease in speed with constant frequency results in a decrease in wavelength.
MCQ No. 248
A physics teacher asks why mirrors do not produce chromatic aberration. The correct explanation is:
a. Reflection is independent of wavelength to a very good approximation.
b. Mirrors absorb all colours equally.
c. Mirrors increase the frequency of light.
d. Reflection changes the refractive index.
Correct answer: a
Explanation: Unlike lenses, mirrors reflect all wavelengths without separating them, so chromatic aberration is absent.
MCQ No. 249
A student wants to design an optical instrument that provides a wide field of view, produces erect images, and requires no electrical power. Which component is most suitable?
a. Concave mirror
b. Convex mirror
c. Convex lens
d. Concave lens
Correct answer: b
Explanation: Convex mirrors satisfy all these requirements and are widely used in security and vehicle mirrors.
MCQ No. 250
Which statement best summarizes the importance of geometrical optics?
a. It explains only the colour of light.
b. It is useful only for laboratory experiments.
c. It provides the fundamental principles used in mirrors, lenses, prisms, optical instruments, vision correction, fibre optics, and many modern technologies.
d. It replaces wave optics completely.
Correct answer: c
Explanation: Geometrical optics forms the foundation of many practical optical devices and technologies. Although wave optics explains additional phenomena such as interference and diffraction, ray optics remains indispensable for understanding image formation and the design of optical systems.
π Continue Your Physics Preparation
If you found this quiz helpful, explore our complete collection of Physics learning resources.
100 Basic • 100 Advance & Numerical • 50 HOTs • Practice Quiz
Learn • Practice • Revise • Excel
Your Complete Physics Learning Platform for Board Exams, MDCAT, ECAT, NUST, PIEAS, GIKI, UET, FAST and Other Competitive Entrance Tests.
More Study Resources for Students and Teachers
************************************
1. English Poems Analysis Hub– A to Z Index (English Poetry) 2. Website for School and College Level Mathematics 3. ASK Rare Class Notes – Study Resources for Students & Teachers
© 2026 & onwards Academic Skills and Knowledge (ASK)
Note: Write me in the comments box below for any query and also Share this information with your classmates and friends.
© https://askrareclassnotes.blogspot.com | Learn • Practice • Succeed
© https://askrareclassnotes.blogspot.com | Learn • Practice • Succeed
Best Tools and Supplies for Students and Teachers:
π Grammar Books – Improve Writing, Score Higher
πͺ Study Chairs – Sit Comfortably, Study Better
π️ Study Desks – Organized Space, Better Learning
π‘ Desk Lamps – Bright Light, Better Focus
⌚ Digital Watches– Manage Time, Improve Results
π± Phone Stands – Hands-Free Learning Made Easy
π§ Headphones – Focus Better, Learn Without Distractions
⌨️ Wireless Keyboards – Type Faster, Work Smarter
π±️ Wireless Mouse – Smooth Control, Better Workflow
π¨️ Printers – Print Smart, Save TimeDisclosure: The above links on this page are affiliate links. This means that if you make a purchase through them, I may earn a small commission at no additional cost to you. Your support helps me maintain, improve, and continue providing valuable free content on this website.
With Best RegardsASKRare Team
πͺ Study Chairs – Sit Comfortably, Study Better
π️ Study Desks – Organized Space, Better Learning
π‘ Desk Lamps – Bright Light, Better Focus
⌚ Digital Watches– Manage Time, Improve Results
π± Phone Stands – Hands-Free Learning Made Easy
π§ Headphones – Focus Better, Learn Without Distractions
⌨️ Wireless Keyboards – Type Faster, Work Smarter
π±️ Wireless Mouse – Smooth Control, Better Workflow
π¨️ Printers – Print Smart, Save Time
Disclosure: The above links on this page are affiliate links. This means that if you make a purchase through them, I may earn a small commission at no additional cost to you. Your support helps me maintain, improve, and continue providing valuable free content on this website.
Comments
Post a Comment
Note: Write me in the comments box below for any queries and also Share this information with your class-fellows and friends.