Question

Choose the correct statement from the following.
Brewster's angle for a transparent medium is

• A. different for light of different colours
• B. same for lights of different colours
• C. independent of refractive index of the medium
• D. different for lights of same colour

Hint:

Brewster angle is tan inverse of the refractive index, which depends on the colour of light.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Brewster law says that reflected light is fully polarised when \(\tan i_p = \mu\), where \(\mu\) is the refractive index of the medium.

Step 2: Detailed Explanation:
The refractive index changes with wavelength, so \(\mu\) is different for different colours. So \(i_p = \tan^{-1}\mu\) is different for different colours.

Step 3: Check the options.
(B) says the same for all colours, which is wrong. (C) says it does not depend on refractive index, which is the opposite of the law. (D) says it differs for light of the same colour, which is wrong because the same colour has one wavelength and one index.

Final Answer:
Brewster's angle differs for different colours, option (A). \[ \boxed{\text{(A)}} \]