The refractive index of glass is 1.5. And the speed of light in a vacuum is 3×108. Then the speed of light in glass is [[1]]m/s.

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The refractive index of glass is $1.5$ . And the speed of light in a vacuum is $3 \times 10^{8}$ . Then the speed of light in glass is [[1]]m/s.

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The speed of light in glass is

2 \times 10^{8}

m/s.
Let the speed of light in glass be

v m / s

.
Given,
Refractive index of glass,

μ = 1.5

Speed of light in vacuum,

c = 3 \times 10^{8} m / s

Therefore,

v = \frac{c}{μ}

= \frac{3 \times 10^{8}}{1.5}

v = 2 \times 10^{8} m / s .

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