Question

Angular width $(\beta )$ of central maximum of a diffraction pattern on a single slit does not depend upon

• A. distance between slit and screen
• B. wavelength of light used
• C. width of the slit
• D. frequency of light used

Answer 1

Answer: (A)

For single slit diffraction pattern
$d\sin \theta =\lambda (d=$ slit width $)$
Angular width $=2\theta =2{\sin }^{-1}\left(\frac{\lambda }{d}\right)$
It is independent of $D$ i.e. distance between screen and slit.