COMEDK Exam 2016 Solved Paper

If n be the number of waves, then wavelength of light in glass, λg=‌

0.04

n

and wavelength of light in water, λw=‌

0.05

n

Speed of light in glass, vg=λg×f=‌

0.04f

n

where, f= frequency of light.
Similarly, speed of light in water, vw=λw×f=‌

0.05f

n

Relative refractive index
‌=‌

µw

µg

=‌

vg

vw

=‌

0.04f

n

×‌

n

0.05f

=‌

4

5

⇒µg‌=‌

5

4

×µw=‌

5

4

×‌

4

3

=‌

5

3