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  4. 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 × 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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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 $5 \times 10^{-5} cm$. The distance of the first dark band of the diffraction pattern from the centre of the screen is

NEETNEET 2016Wave Optics

Solution:

$x = \frac{5\times10^{-5} \times60}{ 0.02}$
$ x = \frac{300 \times10^{-5}}{0.02} = 0.15 cm $

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