Question

Why observable interference fringe pattern cannot be obtained by using two incoherent sources in an interference experiment? Justify your answer.

Answer 1

Answer:

Temporal Coherence is a measure of the correlation of light wave’s phase at different points along the direction of propagation – it tells us how monochromatic a source is.

Spatial Coherenceis a measure of the correlation of a light wave’s phase at

different points transverse to the direction of propagation - it tells us how uniform the phase of a wavefront is.

Only coherent waves can interfere.