The velocity of light in vacuum is:

3 \times 10^{8} m s^{- 1}

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5 \times 10^{8} m s^{- 1}

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3 \times 10^{5} m s^{- 1}

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6 \times 10^{8} m s^{- 1}

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Solution

The correct option is A $3 \times 10^{8} m s^{- 1}$
The speed of light in vacuum is exactly 299792458 $m s^{- 1} \approx 3 \times 10^{8} m / s$ .

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The velocity of light in a glass block of refractive index 1.5 is:

(Velocity of light in air = 3 x 10⁸ m s^-1)

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(Take the speed of light in air $= 3 \times 10^{8} m s^{- 1}$ )

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