Question

A point source of light is attached to the base of an empty trough.A transparent liquid of refractive index 1.35 is filled in the trough to a height of 50cm. Calculate the total area on the surface of the liquid through which light will emerge

Answer 1

Answer:

From the definition of critical angle,

tan c =

h

r

Now, for the given refractive index, tan c =

μ

2

−1

1

Now, μ=

3

5

tan c =

4

3

Thus,

h

r

=

4

3

For r=1

h =

3

4