Light - Refraction

The bending of light ray is called -----------

• reflection

• refraction

The bending of light ray is due to change in speed of light in different media. State True or False.

• True

• False

When a light ray is travelling from denser medium to rarer medium, it -----------.

• bends towards the normal

• bends away from the normal

• does not bend

When a light ray is incident normally from rarer medium to denser medium, it -------------.

• bends towards the normal

• bends away from the normal

• does not bend

When a light ray travels from rarer medium to denser medium, it -----------.

• bends towards the normal

• bends away from the normal

• does not bend

The measure of change in speed of light as it travels from one medium to another is called -----------

• reflective index

• refractive index

Unit of refractive index is

• m/s

• m/s2

• no unit

The appearance of bend in pencil is due to -----------------

• refraction of light ray

• reflection of light ray

• dispersion

------------ is also called Snells law.

• The second law of refraction

• The first law of refraction

• The second law of reflection

What is the speed of light in air?

• 3 x 10 ^ 8 m/s

• 2 x 10 ^ 8 m/s

• 1 X 10 ^ 8 m/s