Question

for the same angle of incidence 45 degree, the angle of refraction in two transparent media 1 and 2 is 20 degree and 30 degree respectively. out of 1 and 2 which is optically denser medium and why ?

Answer 1

Given:
Angle of incidence =I = 45 degrees
Medium 1 angle of refraction= 20 degrees
Medium 2 angle of refraction=30 degrees.
Medium 1 is optically denser as angle of refraction is less . So light rays bends more towards normal.

Conclusion:
Medium 1 is optically denser medium.

Answer 2

medium 1 is optically denser than medium 2 as the speed of light decreases and the ray bends towards the normal...hope it helps u