Question

Light propagates faster through Medium A than through another Medium B. (a)Which of the two media has a higher optical density?
(b)State the condition under which no 'change in the direction of propagation of a light day would take place when it passes from Medium A to Medium B.

Answer 1

medium a has higher optical density

Answer 2

a) Medium B is optically denser
b) when angle I = angle r (the light goes straight without any change in its direction)