Physicsmedium · Past Paper
If the speed of light in a medium is 1.5 x 10^8 m/s, what is the critical angle for that medium with respect to air?
A30 degrees
B45 degrees
C60 degrees
D90 degrees
✓ Correct Answer: A — 30 degrees
n = c/v = 3/1.5 = 2. sin(C) = 1/n = 1/2. Therefore, C = 30 degrees.
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