A beam of light travelling in water enters a glass plates. Calculate the angle of incidence for which the reflected light will be completely plane polarised. Take `mu_("water") = 1.33 and mu_("glass") = 1.5`.

Explanation

To solve the problem of finding the angle of incidence for which the reflected light will be completely plane polarized when a beam of light travels from water into a glass plate, we can follow these steps:

### Step 1: Understand the Concept of Polarization
When light reflects off a surface, it can become polarized. The angle at which this occurs is known as Brewster's angle (or polarizing angle), which can be calculated using the refractive indices of the two media involved.

### Step 2: Identify the Refractive Indices
Given:
- Refractive index of water, \( \mu_{water} = 1.33 \)
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