Question

Is an LED a coherent light source ?

Answer 1

Coherent light source

1. Coherent sources of light are those sources that emit a light wave having the same frequency, wavelength, and in the same phase or they have a constant phase difference.
2. A coherent source forms sustained interference patterns when superimposition of waves occurs and the positions of maxima and minima are fixed.

LED

1. A light-emitting diode(LED) is a semiconductor device that emits light when an electric current flows through it.

Is an LED a coherent light source?

1. No, an LED is not a coherent light source because even if they do have waves that have the same frequency, these waves will not be in phase with each other.
2. Therefore, an LED cannot produce coherent light.

Hence, an LED is not a coherent light source.