Question

The sources which can give sustained interference are:

• A. two independent laser sources
• B. two independent light bulbs
• C. two light sources of very large width
• D. two sources far away from one other

Answer 1

The correct option is A two independent laser sources

Laser sources produce light waves which are coherent. As sustained interference takes place between waves, which are coherent, we can use two independent laser sources for the same.