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Question

A parallel beam of monochromatic light of wavelength 6000 ˚A is incident normally on a single narrow slit of width 0.003 mm. The light is focused by a convex lens on a screen placed on the focal plane. The second maximum will be formed for the angle of diffraction equal to,

A
30
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B
15
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C
0
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D
60
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Solution

The correct option is A 30
For the second maximum, asinθ=5λ2

sin θ=5λ2a

=(5×6000×10102×0.003×103)=0.5

θ=30

Hence, (C) is the correct answer.

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