
In what ways optic fiber plays an important role in medicine?
Important Questions on Refraction of Light

The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. Complete the path of the ray PQ till it emerges out of the block. Write necessary angles.



A light ray travelling in glass medium is incident on glass-air interface at an angle of incidence . The reflected () and transmitted () intensities, both as function of , are plotted. The correct sketch is:

The critical angle for glass is for the light of yellow colour. State whether it will be less than equal to or more than for:
a. Red light
b. Blue light


In the given diagram a source of light is placed at the bottom of a beaker containing water. Complete the diagram. (Critical angle for water to air is )



A swimmer inside water looks up at the sky through the surface of water. The sky is bright due to daylight. He can see:

(b) What is the answer if there is no outer covering of the pipe?


The velocity of light in transparent media and separated by a plane boundary are and respectively. The critical angle for a light ray passing from to at the boundary is:



A ray of light travelling in a transparent medium of refractive index falls, on a surface separating the medium from air at an angle of incidence of . The ray can undergo total internal reflection for which of the following ?





