The refractive index if water is $4 / 3$ . What would be the speed of light in it?

7.25 \times 10^{8} m / s

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2.25 \times 10^{8} m / s

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5.25 \times 10^{8} m / s

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6.25 \times 10^{8} m / s

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Solution

The correct option is B $2.25 \times 10^{8} m / s$
$n_{w} = \frac{4}{3}$
$= \frac{c}{v_{w}} = \frac{3 \times 10^{8} \times 3}{4}$
$= 2.25 \times 10^{8} m / s$

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Similar questions

The refractive index of water is $\frac{4}{3}$ . The speed of light in water is:

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

Solve:

(1) The speed of light in a transparent medium is 2.4 × 10⁸ m/s. Calculate absolute refractive index of the medium.

(2) The speed of light in water and glass is 2.2 × 10⁸ m/s and 2 × 10⁸ m/s, respectively. What is the refractive index of −

(a) water w.r.t. glass

(b) glass w.r.t. water.

(3) Refractive index of water is 4/3 and speed of light in air is 3×10⁸ m/s. Find speed of light in water.

2.25 \times 10^{8} m / s

3 \times 10^{8} m / s

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