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Q.

A diffraction pattern is obtained using a beam of redlight. What happens if the red light is replaced by blue light

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a

no change

b

diffraction bands become narrower and crowded together

c

bands become broader and farther apart

d

bands disappear

answer is B.

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Detailed Solution

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when the red light is replaced by blue light, the wavelength decreases which means that the fringe width decreases and pattern becomes narrower and crowded together.

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