Optics Question 1066

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

[CPMT 1971; DPMT 1999]

Options:

A) 0.25 mm

B) 0.1 mm

C) 1.0 mm

D) 0.01 mm

Show Answer

Answer:

Correct Answer: C

Solution:

$ \beta =\frac{\lambda D}{d}=\frac{5\times {{10}^{-7}}\times 2}{{{10}^{-3}}}m={{10}^{-3}}m=1.0\ mm $ .



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