Class 8 General Science Notes: - Unit-9: Reflection and Refraction of Light: Solved Exercise (Short Questions and Answers)

(National Book Foundation - New Book/New Syllabus Based on National Curriculum Pakistan 2023-2024 and Onwards)

(Class 8 General Science Notes for 8th Centralized Exam 2023-2024 and onward, FDE, Islamabad)

B. Short Questions 

i). How can we see ordinary, non-luminous objects?

Ans:

For an ordinary, non-luminous object (such as table or chair) to be visible, the light needs to be reflected into our eyes to make them visible.

ii) Do you need a full-length mirror to see your hair and your feet at the same time? Does it depend on how far you stand from the mirror?

Ans:

To see our hair and our feet at the same time, we need the minimum size of the mirror should be one-half of the person’s height. This is because, in reflection, the angle of incidence is equal to the angle of reflection. The distance of the object from the mirror does not affect the image by the mirror.

iii) What is the minimum number of mirrors needed to see back of your head?

Ans:

A minimum of two mirrors are needed to see the back of our heads.

iv) At which position do the image and object have the same magnification?

Ans:

When an object is placed at the Centre of curvature, the image and object have the same magnification. 

v) Can a convex mirror produce a real image of an object?

Ans:

Convex mirrors always form virtual images. For convex mirrors focal point and centre of curvature are virtual points, so the image formed inside the mirror is virtual.

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Unit-9: Reflection and Refraction of Light: Solved Short Questions and Answers

Class 8 General Science Notes

Source: General Science Book (National Book Foundation, Pakistan)

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