1
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Question

# In a Young's double slit experiment, the distance between the two identical slits is 6.1 times larger than the slit width. Then the number of intensity maxima observed within the central maximum of the single slit diffraction pattern is :

A
3
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B
6
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C
12
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D
24
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Solution

## The correct option is A 12In diffraction, angular width of central maxima is 2λbwhere b is slit width.In Young's double slit experiment, angular width of each fringe is λdwhere d is the distance between the two slits.Given : d=6.1b So, number of maximas observed in central maxima of diffraction pattern n=2λbλd∴ n=2db=2×6.1=12.2Thus 12 maximas are observed.

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