Question

The refractive index of glass with respect to water is 9/8. If the velocity and wave length of light in glas are 2 x 10 m/s and 4000 A respectively. Then the velocity and wavelength of light in water are a) 225x10 m/s, 4500A [0] b) 2.25x10 m/s, 5000A c) 3x10 m/s, 4500A d) 3x10 m/s.5000A​

Answer 1

Answer:

Correct option is

B

2.25×10

8

m/s; 4500 A.U.

Given μ

gw

=

8

9

;v

g

=2×10

8

;λ

g

=4000

A

˚

We know μ

gw

=

v

g

v

w

v

w

=

8

9

×2×10

8

=2.25×10

8

Also we know,μ

gw

=

λ

g

λ

w

λ

w

=

8

9

×4000

A

˚

=4500

A

˚

your answer