Refractive Index - Absolute and Relative

Refractive Index - Absolute and Relative

By Mr Yong

• ​Refers to the refractive index of a given medium

• n is the absolute refractive index

• c is the speed of light in a vacuum

• ​v is the speed of light in the medium

​

Absolute Refractive Index

​

Multiple Choice

The absolute refractive index of medium X is 1.39.

What is the speed of light in medium X ?

• $$1.68\times10^8$$  m/s

• $$2.16\times10^8$$  m/s

• $$2.74\times10^8$$  m/s

• $$4.17\times10^8$$  m/s

Multiple Choice

The speed of light in medium Y is $$2.21\times10^8$$  m/s.

What is the absolute refractive index of medium Y?

• 0.737

• 1.34

• 1.35

• 1.36

Relative Refractive Index / Snell's Law

​

Relative Refractive Index / Snell's Law

​

Multiple Choice

A light ray travels from medium X to medium Y.

The refractive index of medium X is 2.05.

The refractive index of medium Y is 1.55.

What is the relative refractive index?

• 0.50

• 0.756

• 1.32

• 3.60

Multiple Choice

A light ray travels from medium X to medium Y.

The relative refractive index is 2.36.

The refractive index of medium X is 1.11.

What is the refractive index of medium Y?

• 0.424

• 1.25

• 2.12

• 2.62

Multiple Choice

A light ray travels from medium X to medium Y.

The relative refractive index is 2.36.

The angle of refraction is 15°.

What is the angle of incidence?

• 0.61°

• 25°

• 35°

• 38°

Multiple Choice

A light ray travels from medium X to medium Y.

The angle of incidence is 45°.

The angle of refraction is 15°.

The refractive index of medium X is 1.36.

What is the refractive index of medium Y?

• 0.27

• 0.45

• 3.7

• 4.1

Multiple Choice

A light ray travels from medium X to medium Y.

The angle of incidence is 25°.

The angle of refraction is 35°.

The speed of light in medium Y is $$1.01\times10^8$$  m/s.

What is the speed of light in medium X?

• $$7.3\times10^7$$  m/s

• $$7.4\times10^7$$  m/s

• $$1.3\times10^8$$  m/s

• $$1.4\times10^8$$  m/s

Multiple Choice

A light ray travels from medium X to medium Y.

The angle of incidence is 25°.

The speed of light in medium X is $$1.01\times10^8$$  m/s..

The speed of light in medium Y is $$2.99\times10^8$$  m/s.

What is the angle of refraction?

• 8.2°

• 8.4°

• 33°

• 53°

Multiple Choice

A light ray travels from medium X to medium Y.

The angle of refraction is 15°.

The speed of light in medium X is $$2.99\times10^8$$  m/s.

The speed of light in medium Y is $$1.01\times10^8$$  m/s.

What is the angle of incidence?

• 0.08°

• 5°

• 44°

• 50°