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Q.

A screen is placed 50cm from a single slit, which is illuminated with 6000 Ao light. If distance between the first and third minima in the diffraction pattern is 3mm, the width of the slit is

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a

0.1mm

b

0.2mm

c

0.3mm

d

0.4mm

answer is B.

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Detailed Solution

Position of nth minima yn=nλDd⇒y3−y1=λDd(3−1)=2λDd⇒3×10−3=2×6000×10−10×0.5d⇒d=0.2×10−3m=0.2mm
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