Distinguish between myopia and hypermetropia. Draw diagrams to show how these defects can be corrected by using suitable lenses.

Important Questions on Refraction and Dispersion of Light

EASY

8th CBSE

IMPORTANT

Living Science 8>Chapter 16 - Refraction and Dispersion of Light>EXERCISES>Q 1

Can a glass slab bend different coloured lights by different amounts?

HARD

8th CBSE

IMPORTANT

Living Science 8>Chapter 16 - Refraction and Dispersion of Light>EXERCISES>Q 2

You have seen that a prism splits up light into different colours as it bends different colour lights by different amounts. Why does a glass slab not cause dispersion?

MEDIUM

8th CBSE

IMPORTANT

Living Science 8>Chapter 16 - Refraction and Dispersion of Light>EXERCISES>Q 3

Suppose a swimming pool is filled with an imaginary liquid which is optically rarer than air. For a person looking at the pool from outside, will the apparent depth of the pool be less than or greater than the real depth? Give reasons.

EASY

8th CBSE

IMPORTANT

Living Science 8>Chapter 16 - Refraction and Dispersion of Light>EXERCISES>Q 4

What type of image is formed when rays of light coming from a point on the object diverge after reflection or refraction-real or virtual?

MEDIUM

8th CBSE

IMPORTANT

Living Science 8>Chapter 16 - Refraction and Dispersion of Light>EXERCISES>Q 5

Will a spectrum be formed if blue light falls on a prism? Give reasons.

HARD

8th CBSE

IMPORTANT

Living Science 8>Chapter 16 - Refraction and Dispersion of Light>BE A SCIENTIST

The diagram shows three different light rays falling on prisms. Complete each diagram to show the refracted and emergent rays. What difference will there be between the three?

MEDIUM

8th CBSE

IMPORTANT

Living Science 8>Chapter 16 - Refraction and Dispersion of Light>VALUES

While walking to school, you see a visually-challenged person wanting to cross a busy road. But the traffic is very heavy and nobody is willing to stop for him. What will you do?

MEDIUM

8th CBSE

IMPORTANT

Living Science 8>Chapter 16 - Refraction and Dispersion of Light>ORAL QUESTIONS>Q 1

When light enters water from air, what change is observed in its speed?