Physicsmedium · Past Paper
A ray of light enters a glass slab perpendicularly (at 90 degrees to the surface). The angle of refraction is:
A90 degrees
B45 degrees
C0 degrees
D30 degrees
✓ Correct Answer: C — 0 degrees
If angle of incidence is 0 (normal incidence), the ray passes undeviated, so angle of refraction is 0.
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