If you punched a metal plate with two pinholes and illuminated them with light, would you see interference fringes if you used:
(a) laser light, or
(b) light from an LED (light emitting diode) ?
(c) sunlight ?
(d) spontaneous emission coming out the side of the He-Ne laser ?
The answer is (a) only
The phenomenon of interference is observed due to superposition of two monochromatic coherent waves, traveling in same direction in the medium.
Monochromatic light means the light of a single ...
The interference in different situations is discussed.