Question

The refractive index of glass is 1.6 and speed of light in air is 38m/s find speed of light in glass

Answer 1

Refractive index of glass = speed of light in air (vaccum)/speed of light in glass
1 .6=38/speed of light in glass
speed of light in glass=38/1.6
speed of light in glass = 38/1.6×10
speed of light in glass=38/16
speed of light in glass=2.375
" " " =2×(10)3 m/s

Answer 2

The speed of light in glass having a refractive index of 1.6 is 23.75 m/s

Given

The Refractive index of glass is 1.6

Speed of light in air = 38 m/s

To Find

Speed of light in the glass

Solution

The equation to find the speed of light in a medium of refractive index $n$ is $\frac{c}{n}$, where $c$ is the speed of light in air.

Here, the speed of light in air is given as $38$ m/s, and refractive index is given as $1.6$

Therefore the speed of light in the glass is $\frac{38}{1.6}$ m/s = $23.75$ m/s

Hence the speed of light in the glass is $23.75$ m/s