Question

The refractive inden of glass is 1.5 what is
the speed of light in the glass? Given speed
of light in air is 3110 m/8?​

Answer 1

Given:-

• Refractive index of Glass ,ng = 1.5

• Speed of light in air ,c = 3 × 10⁸ m/s.

To Find:-

• Speed of light in glass ,v

Solution:-

Using Snell's Law .

• ng = c/v

where,

ng is the refractive index of glass

c is the speed of light in air

v is the speed of light in glass

Substitute the value we get

→ 1.5 = 3×10⁸/v

→ 1.5 × v = 3×10⁸

→ v = 3 × 10⁸/1.5

→ v = 2×10⁸ m/s

Therefore, the speed of light in glass is 2 × 10⁸m/s.

Answer 2

Given:-

$\bigstar$Refractive index of glass = 1.5$\\\:$

$\bigstar$Speed of light in air = 3.0 x 10⁸ m / s$\\\:$

To Find:-

$\bigstar$The speed of light in the glass.$\\\:$

Solution:-

$\bigstar$We know that,$\\\:$

$\bigstar$η = speed of light in vacuum /speed of in light medium $\\\:$

$\bigstar$η = 3 × 10⁸ / v = 1.5$\\\:$

$\bigstar$v = 2 × 10⁸ m / s$\\\:$

$\bigstar$The speed of light in the glass is 2 × 10⁸ m / s$\\\:$