Question

1
6. A point light source 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 50 cmn.
Calculate the total area on the surface of the liquid through which light will
emerge.
1 towards the​

Answer 1

Answer:

rays from the point source can be seen from outside only if they refract at the surface and can come out , this happens only till angle of incidence of light ray from source is below critical angle . and at critical angle it graces

by Snell's law .

2.72 sin α =μ×sin 90

0

11.54

2.72×5.77

=μ

μ = 1.36

refractive index of outer region is 1.36

solution