Light enters from air to glass having refractive Index $1.50$ . What is the speed of light in the glass?

3 \times 10^{8} m / s

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2 \times 10^{8} m / s

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0.5 \times 10^{8} m / s

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4.5 m / s

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Solution

The correct option is B $2 \times 10^{8} m / s$
$Refractive index=Speed of light in vacuumSpeed of light in medium$
Therefore, $Refractive index of glass=Speed of light in vacuumSpeed of light in glass$
Speed of light in glass $=Speed of light in vacuumRefractive index of glass$
$= \frac{3 \times 10^{8} m / s}{1.5}$
Hence, speed of light in it glass $= 2 \times 10^{8} m / s$

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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.

Medium	Speed of light
Vacuum Flint glass Crown glass	3.00 × 10⁸ m/s 1.86 × 10⁸ m/s 1.97 × 10⁸ m/s

{3.00 \times 10}^{8} m / s, {1.86 \times 10}^{8} m / s a n d {1.97 \times 10}^{8}

3 \times 10^{8} m / s

X

1.5 \times 10^{8} m / s

3 \times 10^{8} m / s

X

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