Question

how much time will light Take to cross 2mm. thick glass panes if refractive index of glass is 3/2​

Answer 1

Answer:

Speed of light in glass = c / refractive index of glass

= 3 * 10^8 / 3/2

= 2 * 10^8 m / s

time = 2mm / 2 * 10^8 m / s

= 1 mm / 10^8 m/s

= 10^-3 m / 10^8 m / s

= 10^-11 s

Ans: 10^-11 seconds