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Q.

A single slit of width 0.20 mm is illuminated with light of wavelength 500 nm. The observing screen is placed  80 cm from the slit. The width of the central bright fringe will be

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a

1 mm

b

2 mm

c

5 mm

d

4 mm

answer is C.

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Detailed Solution

Width of central bright fringe.

2λDd=2×500×10−9×80×10−20.20×10−3

=4×10−3m=4mm. 

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