Question

The refractive index of glass is 1.5 if speed of light in glass is 2 x 10^8 m/s find speed of light in air and speed of light in oil if it's refractive index is 1.4

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