Optics Question 1142

Question: In a Young’s double-slit experiment the fringe width is 0.2 mm. If the wavelength of light used is increased by 10% and the separation between the slits is also increased by 10%, the fringe width will be

[MP PMT 2004]

Options:

A) 0.20 mm

B) 0.401 mm

C) 0.242 mm

D) 0.165 mm

Show Answer

Answer:

Correct Answer: A

Solution:

$ \beta =\frac{\lambda D}{d} $ ; If $ \lambda $ and d both increase by 10%, there will be no change in fringe width $ (\beta ) $ .



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