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Question: A narrow slit of width 1 mm is illuminated by monochromatic light of wavelength 600 nm. The distance...

A narrow slit of width 1 mm is illuminated by monochromatic light of wavelength 600 nm. The distance between the first minima on either side on a screen at a distance of 2 m is –

A

1.2 cm

B

1.2 mm

C

2.4 cm

D

2.4 mm

Answer

2.4 mm

Explanation

Solution

2q = 2×λd\frac{2 \times \lambda}{d} = 2×600×10−91×10−3\frac{2 \times 600 \times 10^{- 9}}{1 \times 10^{- 3}};

so 2x = D (2q) =2×600×10−910−3\frac{2 \times 600 \times 10^{- 9}}{10^{- 3}}= 2.4 mm