7.4 Refraction: Air and Water

Question 1

What is refraction?

Answer 1

Refraction is the phenomena where light travelling through media of different densities, changes its speed and hence bends or deviates from its original path.

Question 2

What is the angle of refraction?

Answer 2

The angle of refraction is the angle between the normal at the point of incidence and the refracted ray.

Question 3

What is the emergent ray?

Answer 3

An emergent ray seems to be a refracted beam that originates from a medium after refraction.

Question 4

What are the rules of refraction?

Answer 4

Rules of Refraction -
1. Light passing from a rarer medium to a denser medium bends towards the normal.
2. Light passing from a denser medium to a rarer medium bands away from the normal.

Question 5

What is a perpendicular?

Answer 5

A perpendicular is the shortest distance between a light and a point.

Question 6

What is optical density?

Answer 6

Optical density is the density of a medium which is experienced by light.

Question 7

What is apparent depth? What is real depth?

Answer 7

Apparent depth is the depth of an object’s image which is in a medium whereas the real depth is the actual depth of an object.

Question 8

What does the speed of light in different materials depend on?

Answer 8

The speed of light in different materials depends on the density of that material.

Question 9

What is the formula for the refractive index? What does higher or lower refractive index mean?

Answer 9

The formula for refractive index is n=c/v

The higher the refractive index of an object, the more the light is refracted.