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Question: Monochromatic green light of wavelength \(5 \times 10^{- 7}m\)illuminates a pair of slits 1 mm apart...

Monochromatic green light of wavelength 5×10−7m5 \times 10^{- 7}milluminates a pair of slits 1 mm apart. The separation of bright lines on the interference pattern formed on a screen 2 m away is.

A

0.25 mm

B

0.1 mm

C

1.0 mm

D

0.01 mm

Answer

1.0 mm

Explanation

Solution

β=λDd=5×10−7×210−3m=10−3m=1.0 6mumm\beta = \frac{\lambda D}{d} = \frac{5 \times 10^{- 7} \times 2}{10^{- 3}}m = 10^{- 3}m = 1.0\mspace{6mu} mm.