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Q.

If the first minima in Young's double-slit experiment occurs directly in front of one of the slits (distance between slit and screen D = 12 cm and distance between slits d = 5 cm), then the wavelength of the radiation used can be

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a

23 cm

b

43 cm

c

2 cm

d

4 cm

answer is A, C.

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Detailed Solution

 Path difference =D2+d2−D=1cm

Also, D2+d2−D=(2n−1)λ2

        λ=2(1)2n−1

For  n=1,2,3,…    λ=2cm,23cm,25cm,…

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