Question

Two independent light sources act as coherent sources’.

(a) True

(b) False

I got this question in a national level competition.

I need to ask this question from Wave Optics in section Wave Optics of Physics – Class 12

Answer 1

The correct answer is (b) False

For explanation I would say: Two independent sources of light cannot be coherent. This is because the light is emitted by individual atoms when they return to the ground state. Even the smallest source of light contains billions of atoms which obviously cannot emit light waves in the same phase.