Q.

A beam of light consisting of two wavelengths 650 nm and 520 nm is used to illuminate the slit of a Young's double slit experiment. Then the order of the bright fringe of the longer wavelength that coincide with a bright fringe of the shorter wavelength at the least distance from the central maximum is

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a

1

b

2

c

3

d

4

answer is D.

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Detailed Solution

nβ1=(n+1)β2⇒n×650×10−19Dd=(n+1)×520×10−19×Dd⇒n=4
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A beam of light consisting of two wavelengths 650 nm and 520 nm is used to illuminate the slit of a Young's double slit experiment. Then the order of the bright fringe of the longer wavelength that coincide with a bright fringe of the shorter wavelength at the least distance from the central maximum is