First slide

Coherent sources and their importance in interference

Question

The slits in a Young's double slit experiment have equal widths and the source is placed symmetrically relative to the slits. The intensity at the central fringes is I₀. If one of the slits is closed, the intensity at this point will be

Easy

A

I_o
B

I₀ / 4
C

I₀ / 2
D

4I₀

Solution

If intensity of each wave is I, then initially at central position $I_{0} = 4 I$ . when one of the slit is covered then intensity at central position will be I only i.e., $\frac{I_{0}}{4}$

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