By the principle of single slit diffraction pattern
θ=aλ=fy
y=afλ=0.0260×5×10−5=0.15cm
A linear aperture whose width is 0.02cm is placed immediately in front of a lens of focal length 60cm. The aperture is illuminated normally by a parallel beam of wavelength 5×10−5cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is
Held on 30 Apr 2016 · Verified 9 Jul 2026.
0.10cm
0.25cm
0.20cm
0.15cm
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