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Q.

A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength 5 x 10-5 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is : 

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a

0.25 cm

b

0 .20 cm

c

0.10 cm

d

0.15 cm

answer is B.

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Detailed Solution

f = D = 60 cm

For first minima,

y=λDa=5×10−7×602×10−2×10−2−5×10−3×602=0.15cm

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