Optics Question 221

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

[IIT-JEE 1994; KCET 2004]

Options:

A) 1.2 mm

B) 1.2 cm

C) 2.4 cm

D) 2.4 mm

Show Answer

Answer:

Correct Answer: D

Solution:

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



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