Statement-I : In Young's double slit experiment interference pattern dissappears when one of the slits is closed
Statement-II : Interference is observed due to superposition of light waves from two coherent source

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 two light waves of exactly equal frequency having phase difference which is constant with respect to time travelled in same direction and superimpose, then interference occurs. When one of the slits is closed then illumination from a single source is obtained. Thus, interference does not occur.