Question

A ray of light moves from air into a glass slab the refractive index of glass slab is 1.5 what is the speed of light in the glass​

Answer 1

Explanation:

we know that refractive index n=

speedoflightinmedium

speedoflightinvacuum

where c=3×10

8

m/s

1.5=

v

c

v=

1.5

3×10

8

v=2×10

8

m/s

For critical angle we will use snell's law

C is critical angle

n

glass

sinC=n

air

sin90 n

air

=1

sinC=

n

glass

1

=

1.5

1

C=41.8

o

Hope this helps mate.

Answer 2

Answer is 2×10^8.Hope this is helpful.