Find the polarising angle and the angle of refraction in glass if the critical angle for a certain wavelength of light in glass is `40^@`.

Explanation

To solve the problem of finding the polarizing angle and the angle of refraction in glass given the critical angle of 40 degrees, we can follow these steps:

### Step 1: Understand the Critical Angle
The critical angle (ic) is the angle of incidence in a denser medium (glass) for which the angle of refraction in the rarer medium (air) is 90 degrees.

### Step 2: Use Snell's Law to Find the Refractive Index
According to Snell's Law:
\[
...