Question

A ray of light is passing through a medium of refractive index 1.5. Calculate the speed of light
in this medium if the speed of light in vacuum is 3 x 100000000 m/s

Answer 1

Answer:

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