Question

light enters from air into a glass plate having refractive index 1.5 calculate the speed of light in glass (speed of light in air = 3*10^8 m/s)

Answer 1

Refractive index = 1.5
Speed in air = 3*10^8m/s
Speed in glass = V

According to the formula,

Refractive Index of glass with respect to air = Speed in air/ Speed in glass

1.5 = 3*10^8/V
V= 2*10^8 m/s

So, speed of light in glass is: 2*10^8m/s

Answer 2

Answer:2 *10^8 m/s

Explanation:

Refractive index = 1.5

Speed in air = 3*10^8m/s

Speed in glass = V

According to the formula,

Refractive Index of glass with respect to air = Speed in air/ Speed in glass

1.5 = 3*10^8/V

V= 2*10^8 m/s

So, speed of light in glass is: 2*10^8m/s