Question

Light travels through a glass plate of thickness t and having a refractive index μ. If c is the velocity of light in vacuum, the time taken by the light to travel this thickness of glass is ______.

Options

• tc/μ

• μc/t

• μt/c

• t μ c

Answer 1

Light travels through a glass plate of thickness t and having a refractive index μ. If c is the velocity of light in vacuum, the time taken by the light to travel this thickness of glass is μt/c.

Explanation:

The speed of light in glass plate, `v = "c"/mu`

Therefore, time taken by light to traverse the thickness of the glass plate = `"t"/("c"//mu)  (mu"t")/"c"`.