Question 421: Wave Optics

Question

A beam of light of $\lambda  = 600$ nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is

Accepted Answer

Distance between the first dark fringes on either side of the central bright fringe is also the width of central maximum.
Width of central maximum = ${{{2\lambda D} \over a}}$
= ${{2 	imes 600 	imes {{10}^{ - 9}} 	imes 2} \over {{{10}^{ - 3}}}}$
= 24 ÃÂ 10
Ã¢ÂÂ4
m = 2.4 ÃÂ 10
Ã¢ÂÂ3
m = 2.4 mm

Answer

1.2 cm

Answer

1.2 mm

Answer

2.4 cm

Answer

2.4 mm

Wave Optics

A beam of light of \lambda = 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is

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