Ray optics

Ans : c

@IshittaU The intensity of beam is maximum at center and lowest at the circumference of the beam, and as refractive index is directly proportional to the intensity so it will lowest at the circumference of beam. therefore the speed of the ray at the circumference will move faster then the ray at center and the beam will converge on entering the medium.

@amitkumarbaghel didnt understand can u explain pls
how is refractive index proportional to intensity?
isnt it supposed to be constant for a fixed material?

@amitkumarbaghel how refractive index proportional to intensity?? Some more concise explaination plz...

pls someone explain

please reply