Question

State the conditions under which no 'change in the direction of propogation' of a light ray would take place when it passes from Medium A to Medium B​

Answer 1

Answer:

Answer. If the incident ray follows the normal drawn perpendicularly on the junction plane of 2 mediums, it will not refract. Angle of refraction (angle between the refracted ray and the normal), 'r' also becomes 0 thus no change in direction occurs.