Question

The speed of light in glass is approximately ---------- that in air
100 times faster than
100 times slower than
50 per cent faster than
33 percent slower than

Answer 1

Answer on Question #47008, Physics, Optics

The speed of light in glass is approximately --- that in air

100 times faster than

100 times slower than

50 per cent faster than

33 percent slower than

By definition, refractive index is:

$$n = \frac {c}{v}$$

Where $c$ – is speed of light in vacuum, $v$ – is speed of light in medium.

$$v = \frac {c}{n} = \frac {c}{1.5} = \frac {2}{3} c \approx 0.67 c$$

So, it's approximately $33\%$ slower.

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