First slide

Diffraction of light-Wave Optics

Question

A beam of light of wavelength 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 the first dark fringes on either side of the central bright fringe is

Easy

A

1.2 mm
B

1.2 cm
C

2.4 cm
D

2.4 mm

Solution

Distance between the first dark fringes on either side of central maxima = width of central maxima = $\frac{2 λD}{d} = \frac{2 \times 600 \times 10^{- 9} \times 2}{1 \times 10^{- 3}} = 2.4 mm$

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