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The refractive index of glass with respect to air is $\mu = 1.5$. What is the speed of light in glass if the speed of light in air is $c = 3 \times 10^8 \text{ m/s}$?
- A.$1.5 \times 10^8 \text{ m/s}$
- B.$2.0 \times 10^8 \text{ m/s}$
- C.$2.5 \times 10^8 \text{ m/s}$
- D.$4.5 \times 10^8 \text{ m/s}$
Show correct answer & step-by-step solution
Correct answer: B — $2.0 \times 10^8 \text{ m/s}$
Solution
The refractive index is defined as . Thus, .
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