Physicshard · Past Paper
The velocity of light in two media A and B are 2x10^8 m/s and 2.5x10^8 m/s. The critical angle for light going from A to B is:
Asin^-1(0.8)
Bsin^-1(1.25)
Csin^-1(0.5)
D45 degrees
✓ Correct Answer: A — sin^-1(0.8)
sin(C) = vA/vB (slower/faster) = 2/2.5 = 0.8. So C = sin^-1(0.8).
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