2.6 Refraction of Light

Question 1

What is the equation for refractive index?

Answer 1

n = c / v

Question 2

What does c stand for in the refractive index equation?

Answer 2

The speed of light in a vacuum

Question 3

What does v stand for in the refractive index equation?

Answer 3

The speed of light in the medium

Question 4

What are the equations for Snell’s law?

Answer 4

n₁v₁ = n₂v₂
n₁sinθ₁ = n₂sinθ₂

Question 5

Snell’s Law

Answer 5

At the boundary between any two given materials the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant

Question 6

What are the conditions for total internal reflection?

Answer 6

The angle of incidence is greater than the critical angle

Question 7

At the critical angle what is the equation we can use?

Answer 7

n₁sinθ_c = n₂

Question 8

Monomode Fibres

Answer 8

Is where the core diameter is so small that there is only one possible path through the fibre which is along it’s axis. Parallel to its axis

Question 9

Multimode Fibres

Answer 9

Allow for the passing of multiple waves down a fibre at the same time due to the different waves traveling through the fibre at different angles