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 c m . The distance of the first dark band of the diffr

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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 c m . The distance of the first dark band of the diffraction pattern from the centre of the screen is

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Correct answer: D. 0.15 &#x2009; &#x2009; cm

By the principle of single slit diffraction pattern &#952; = &#955; a = y f y = f &#955; a = 60 &#215; 5 &#215; 10 - 5 0.02 = 0.15 &#160; cm

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 c m . The distance of the first dark band of the diffraction pattern from the centre of the screen is

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