62. The speed of light in water is 2.25 into 10 ki power 8 metre per second refractive index of water is 4 by 3 then find the speed of light in vacuum

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Q. The speed of light in water is 2.25 × 10⁸ m/s. If the speed of light in vacuum be 3 × 10⁸ m/s, calculate the refractive index of water.

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.

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

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

Q. The refractive indexes of glass and water with respect to air are 3/2 and 4/3 respectively. If speed of light is 2 x 10^8 m/s, find the speed of light in water.

(a) State the laws of refraction of light. Give an expression to relate the absolute refractive index of a medium with speed of light in vacuum.

(b) The refractive indices of water and glass with respect to air are $\frac{4}{3}$ and $\frac{3}{2}$ respectively. If the speed of light in glass is $2 \times 10^{8} m s^{- 1}$ , find the speed of light in (i) air, (ii) water

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