Question

In following figure, refractive index of material of prism is 2. i Find angle of incidence ‘i’

Answer 1

Given:

The refractive index of the material of prism is 2.

To  find:

Find the angle of incidence ‘i’

Solution:

We use Snell's law to find the angle of incidence.

So, we have,

n₁ sin θi = n₂ sin θr

From given, we have,

Refractive index = n₂ = 2  

Angle of refraction = θr = 75°

n₁ = 1

θi = ?

1 × sin θi = 2 × sin 75°

sin θi = 2 × sin 75°

= 2 × 0.9659

∴ sin θi = 1.9318

Therefore, the angle of incidence is sin θi = 1.9318