Optics Question 201

Question: Angular width (b) of central maximum of a diffraction pattern on a single slit does not depend upon

[DCE 2000; 01]

Options:

A) Distance between slit and source

B) Wavelength of light used

C) Width of the slit

D) Frequency of light used

Show Answer

Answer:

Correct Answer: A

Solution:

For single slit diffraction pattern $ d\sin \theta =\lambda $ ( $ d= $ slit width)

Angular width = $ 2\theta =2{{\sin }^{-1}}( \frac{\lambda }{d} ) $

It is independent of D i.e. distance between screen and slit



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