allerySpeed of light in a medium of refractive index 1.5 is:
A2 × 10⁸ m/s
B3 × 10⁸ m/s
C4.5 × 10⁸ m/s
D2.5 × 10⁸ m/s
Answer & Solution
Correct answer: A. 2 × 10⁸ m/s
We have v = c/n.
That is v = (3 × 10⁸)/1.5.
So v = 2 × 10⁸ m/s.
Light slows in denser media; this is why it bends.
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