Assertion (A) : The unpolarised light and polarized light can be distinguished from each other by using Polaroid.
Reason (R ) : A Polaroid is capable of producing plane polarized beams of light.

Options

A. (a) If both assertion and reason are true and reason is the correct explanation of assertion.
B. (b) If both assertion and reason are true but reason is not the correct explanation of assertion.
C. (c) If assertion is true but reason is false.
D. (d) If assertion and reason both are false.

Answer

A

Explanation

When a Polaroid is rotated in the path of unpolarised light, the intensity of light coming out from Polaroid remains undiminshed because unpolarised light have vibrations in all possible planes. While a Polaroid when rotated in path of plane polarized light, its intensity will vary form maximum to minimum. Thus, using Polaroid, unpolarised light and polarized light can be distinguished from each other.