A single-slit diffraction pattern is formed on a distant screen.Assuming the angles involved are small,by what factor will the width of the central bright spot on the screen change if the wavelength of the illuminating light is doubled?
A)It will be cut to one-quarter its original size.
B)It will be cut in half.
C)It will double.
D)It will become four times as large.
E)It will become eight times as large.

Question

Quizplus · Accepted Answer

The width of the central bright spot in a single-slit diffraction pattern is directly proportional to the wavelength of the light used. Therefore, if the wavelength is doubled, the width of the central bright spot will also double.

A Single-Slit Diffraction Pattern Is Formed on a Distant Screen