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Q.

A slit 5cm wide is irradiated normally with microwaves of wavelength 1.0cm.  Then the angular spread of central maximum on either side of incident light is nearly

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a

4 radian

b

1/5 radian

c

5 radian

d

6 radian

answer is A.

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Detailed Solution

asinθ=nλ

here for central maximum n=1 and sinθ≃θ

Angular spread =1/5 radian.

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