A ray of light passes normally through a slab $(μ = 1.5)$ of thickness t . If the speed of the light in vacuum be c , then time taken by the ray to go across the slab will be

Open in App

Solution

Velocity in slab $= \frac{c}{μ} = \frac{c}{1.5} = \frac{2 c}{3}$
Time taken to cross the slab $= \frac{3 t}{2 c}$

Suggest Corrections

Similar questions

Q. a ray of light passes normally through a slab of thickness t .if the speed of light in vaccume be c then time taken by the ray to go across the slab will be

Q. A ray of light passes through a glass plate of thickness

t

and refractive index

μ

. If the speed of light in vacuum is

c

, then the time taken by light in passing through the plate will be

Q. The time taken by a ray of light to travel through a glass slab of thickness

2 m m

and refractive index

1.5

will be

If a light ray, incident normally on two glass media such that the time taken to pass through the first slab is t $_{1}$ and through the second slab is t $_{2}$ , then find the value of t $_{1}$ /t $_{2}$ .

Q. A ray Of light takes

10^{- 9}

second to cross a glass slab of refractive index 1.5. The thickness of the slab will be

Join BYJU'S Learning Program

A ray of light passes normally through a slab (μ=1.5) of thickness t . If the speed of the light in vacuum be c , then time taken by the ray to go across the slab will be

Velocity in slab =cμ=c1.5=2c3 Time taken to cross the slab =3t2c

A ray of light passes normally through a slab $(μ = 1.5)$ of thickness t . If the speed of the light in vacuum be c , then time taken by the ray to go across the slab will be

Velocity in slab $= \frac{c}{μ} = \frac{c}{1.5} = \frac{2 c}{3}$
Time taken to cross the slab $= \frac{3 t}{2 c}$