The slits in a Young's double slit experiemnt have equal width and the source is placed symmetrically with respect to the slits. The Intensty ast the central fringe is `I_0`. If one of the slits is closed, the intensit at this point will

Options

A. (a) `I_0`
B. (b) `I_0//4`
C. (c) `I_0//2`
D. (d) `4I_0`

Answer

B

Explanation

If intensity of each wave is I, then initially at central position `I_o=4I`. When one of the slit is covered then intensity at central position will be I only, i.e., `I_o/4`.