Question

A light ray is incident normally on glass slab
of thickness t and refractive index M. Show
that the time taken by the light ray to
travel through the slab i Mt/c​

Answer 1

Answer:

Let, T

1

=time taken to reach from source to surface

T

2

=time taken to travel through glass slab

Speed in glass v=

μ

c

where μ=1.6

Now S

1

=distance of source from the surface

and S

2

=thickness of slab=distance traveled in slab

T

1

=T

2

⟹

c

S

1

=

v

S

2

=

c

S

2

μ

⟹S

1

=1.6×5cm

⟹S

1

=8cm