Question

a) Explain capillary action for mercury in glass capillary.
b) State any four conditions for obtaining well defined and steady interference pattern​

Answer 1

Answer:

a) If the tube is immersed in a liquid which does not wet the glass (mercury), then the liquid level inside the tube decreases. This phenomenon of the rise or fall of liquid in a capillary tube is called capillary action or capillarity. ... The liquid will rise in the capillary tube. The surface of the liquid will be concave

b) (1) The two light sources must be coherent.

(3) The two light sources should be of equal brightness.

(4) The two light sources should be narrow

. (5) The interfering light waves should be in the same state of polarisation.