Question

When do two waves interfere (i) constructively (ii) destructively?

Answer 1

Dear Student,

◆ Conditions for defined interference pattern -

1. Two light sources must be coherent.
2. Light sources must be monochromatic.
3. Superposition of ligjt waves is a condition.
4. Intensity of light sources must be same.

(i) For two light waves to interfere constructively -

1. Two light waves must be in same phase.
2. Path difference between corresponding particles must be nλ.

(ii) For two light waves to interfere destructively -

1. Two light waves must be in opposite phase.
2. Path difference between corresponding particles must be (2n-1)λ/2.

Thanks dear. Hope this helps you...