Question

The observation made by Swarali while doing the experiment are in
below. Based on these write answers to the following questions:
Swarali found that the light my travelling from the denser medium to a rarer medium goes away from the normal. If the angle of incidence (i)is raised by Swarali, the angle of refraction (r)went on increasing However, after certain value of the angle of incidence the light ay is seen to return back into the denser medium. So, Swarali has some questions. Answer them.
(a) Name this certain value of what is the value of at that time?
(b) Name this process of returning of light in the denser medium. Explain
the process​.

Answer 1

Answer:

a) Critical angle r = 90० b) Internal reflection As light is going from denser to rarer medium, if the value of angle of incidence increases then the value of angle of reflection also increases. But after specific angle of incidence (critical angle) the light gets reflected back into the dense medium

Explanation: