EASY
8th CBSE
IMPORTANT
Earn 100

What is meant by 'persistence of vision'? How is this property of the eye used in movie films?

Important Questions on Refraction and Dispersion of Light

HARD
8th CBSE
IMPORTANT
Living Science 8>Chapter 16 - Refraction and Dispersion of Light>EXERCISES>Q E
A coin kept at the bottom of a glass bowl full of water appears to be higher than it actually is. With the help of a labelled diagram, explain why this happens.
HARD
8th CBSE
IMPORTANT
Living Science 8>Chapter 16 - Refraction and Dispersion of Light>EXERCISES>Q E
As an object is slowly brought from infinity to the focus of a convex lens, the image travels from the focus to infinity.' Show this with the help of diagrams with five different positions of the object.
HARD
8th CBSE
IMPORTANT
Living Science 8>Chapter 16 - Refraction and Dispersion of Light>EXERCISES>Q E
Distinguish between myopia and hypermetropia. Draw diagrams to show how these defects can be corrected by using suitable lenses.
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.