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Light of wavelength 6328 Å incident norm...

Light of wavelength 6328 Å incident normally on a slit having a width of 0.2 mm The width of the central maximum, measured from minimum to minimum of the diffraction pattern on a screen 9.0 metres away will be about

A

`0.36^(@)`

B

`0.72^(@)`

C

`0.18 ^(@)`

D

`0.09^(@)`

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The correct Answer is:
A
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