Question

The critical angle for light travelling from medium P to medium Q is 'θ'. The speed of light in medium P is 'v'. Then the speed of light in medium Q is ______.

Options

• v.cosθ

• v(1 - cosθ)

• `"v"/costheta`

• `"v"/sintheta`

Answer 1

The critical angle for light travelling from medium P to medium Q is 'θ'. The speed of light in medium P is 'v'. Then the speed of light in medium Q is `underline("v"/sintheta)`.

Explanation:

`mu="v"^'/"v"`

`therefore1/mu="v"/"v"^'`

`sintheta(1/mu)="v"/"v"^'`

`therefore"v"^'="v"/sintheta`