Light enters from air to dense flint glass with a refractive index of $1.65$ . What will be the speed of light in flint glass?

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Solution

Step-1: Given
The refractive index of flint glass, n = $1.65$
The speed of light in air, c = $3 \times 10^{8} \frac{m}{s}$
The speed of light in flint glass, v =?
Step-2: Calculation
Calculating the speed of light in flint glass,
The refractive index, $n = \frac{c}{v}$
$1.65 = \frac{3 \times 10^{8}}{v} v = \frac{3 \times 10^{8}}{1.65} v = 1.81 \times 10^{8} \frac{m}{s}$
Hence, the speed of light in flint glass is $1.81 \times 10^{8} \frac{m}{s}$ .

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Light enters from air to dense flint glass with a refractive index of 1.65. What will be the speed of light in flint glass?

Light enters from air to dense flint glass with a refractive index of $1.65$ . What will be the speed of light in flint glass?