Q. Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m s–1.
Answer:-
Given, speed of light in vacuum C = 3 × 108 m s–1
Refractive index of glass ng = 1.50
Speed of light in the glass vg = ?
| C | |||
| ng | = |
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| Vg | |||
| 3 × 10 8 | |||
| ng | = |
|
|
| Vg | |||
| 3 × 10 8 | |||
| 1.5 | = |
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| Vg | |||
| 3 × 10 8 | |||
| Vg | = |
|
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| 1.5 | |||
| Vg | = | 2 × 108 ms−1 | |
Speed of light in the glass vg = 2 × 108 ms−1