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Question: Figure shows a double slit experiment. P and Q are the two coherent sources. The path lengths PY and...

Figure shows a double slit experiment. P and Q are the two coherent sources. The path lengths PY and QY are nl and (n + 4) l respectively where n is a whole number and l is wavelength. Taking the central bright fringe as zero, what is formed at Y ?

A

First Bright

B

First Dark

C

Fourth Bright

D

Second Dark

Answer

Fourth Bright

Explanation

Solution

D = (n + 4) l – nl = 4l

at Y point, forms FourthBrightFringe\begin{matrix} FourthBrightFringe \end{matrix}