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Shane Macguire Grade: upto college level
`        The index of refraction of fused quartz is 1.472 for light of wavelength 400 nm and is 1.452 for light of wavelength 760 nm. Find the speeds of light of these wavelengths in fused quartz.`
3 years ago

Deepak Patra
474 Points
```										Sol. We know that, μ base 2/ μ base 1 = v base 1/v base 2
So, 1472/1 = 3 * 10^8/v base 400 ⇒ 2.04 * 10^8 m/sec.
[because, for air, μ = 1 and v = 3 * 10^8 m/s]
Again, 1452/1 = 3 * 10^8/v base 760 ⇒ v base 760 = 2.07 * 10^8 m/sec.

```
3 years ago
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