Question

state the conditions for obtaining well defined and steady interference pattern draw the ray diagram showing positions of virtual sources and a region of interference in biprism experiment
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Answer 1

Answer:

Conditions for a steady and distinct (sharp) interference pattern : <br> (1) The two light sources must be coherent. <br> (2) The two light sources should be monochromatic <br> (3) The two light sources should be of equal brightness. <br> (4) The two light sources should be narrow. <br> (5) The interfering light waves should be in the same state of polarisation. <br> (6) The two light sources should be closely spaced and the distance between the screen and the sources should be large.