Question

State Huygen's principle. Using this principle explain how a diffraction pattern is
obtained on a screen due to a narrow slit on which a narrow beam coming from a
monochromatic source of light is incident normally.​

Answer 1

Explanation:-

A single narrow slit is illuminated by a monochromatic source of light. The diffraction pattern is obtained on the screen placed in front of the slits. There is a central bright region called as central maximum. ... Thus, destructive interference takes place at P and therefore, P is a point of first secondary minimum.