Can two identical bulb of Same …

No because they don't maintain a constant phase difference

Can anyone tell why not

From net

Why do two identical bulbs do not produce interference? Still have a question? Ask your own! What is your question? Ad by Careers360 JEE Main preparation tips from experts. Download the ebook and know tips and tricks to crack JEE Main 2018. Download 4 ANSWERS Eli Pasternak Eli Pasternak, MsEE BsEE, 28 patents, EM fields, comm theory, quantum mechanics, relativity Answered May 1, 2017 · Author has 1.8k answers and 795.5k answer views Lightbulbs, including modern LED types, produce light that is called “non-coherent”. This means that each photon of light has a frequency and phase that is randomly related to other photons from the same lightbulb or from the other one. When two such light sources shine on a surface each pair of photons, one regardless of which lightbulb they came from, do produce an interference pattern even if their frequencies and phases are random, however when we see is a the sum of trillions of such interference patterns, each different from the other and each constantly changing with the emissions of new photons, we get an even-looking smooth surface of light. Only two identical lasers which are highly frequency-stabilized will produce a visible interference pattern on surfaces where their projected lights overlap.

No

But why

Never

If they have same frequency

no because they have different freq.