question_answer

Angular width \[(\theta )\] of central maximum of a diffraction pattern of a single slit does not depend upon:

A)  distance between slit and source

B)  wavelength of light used

C)  width of the slit

D)  frequency of light used

Correct Answer: A

Solution :

 The following ray diagram shows the single slit diffraction pattern. This is guided by Huygens principle. The properties of the system are wholly dependent on the ratio \[\frac{\lambda }{W}\] where\[\lambda \]is wavelength and W the width of slit. Angular width \[=\frac{\lambda }{W}\] Hence, angular width does not depend upon the distance between slit and source.