The refractive index of crown glass is close to 3/2. If the speed of light in air is c, then the speed of light in the crown glass will be close to
- A. (3/2)c
- B. (4/9)c
- C. (2/3)c ✓
- D. (9/4)c
Correct Answer: C. (2/3)c
Explanation
The speed of light in a medium v is given by v = \frac{c}{n}, where n is the refractive index. So, v = \frac{c}{3/2} = \frac{2}{3}c.
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