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Question

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 5×105 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is:
  1. 0.15 cm
  2. 0.10 cm
  3. 0.20 cm
  4. 0.25 cm

A
0.25 cm
B
0.15 cm
C
0.20 cm
D
0.10 cm
Solution
Verified by Toppr

f=D=60 cm
For first minima,
y=λDa=5×107×602×102×102=0.15 cm

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