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
