Question

1. Find the critical angle for light passing from air to glass if the angle of incident is 75^o.

Group of answer choices

A. 40.1^o

B. No critical angle.

C. 75^o

D. 90^o

2. Consider light passing from higher to lower refractive mediums, calculate the transmitted angle (in degrees) if the critical angle is 71°. Round to 2 decimal places.

3. Suppose n₁=1.7 and n₂ = 0.63, if the transmitted angle is given as 31° what is the angle of incidence in degrees? Give answer to 2 decimal places.

Answer 1

1)

The light is passing from air ( lower refractive index) to glass ( higher refractive index ) ,

Snell's law

When , then , which is not possible.

So no critical angle is possible.

Answer is B. No critical angle.

2)

As the light passing from higher to lower refractive mediums, and critical angle is , the transmitted angle must be

Answer is

3)

Transmitted angle is ,

Using Snell's law