A ray of light incident on the face AB of an isosceles triangular prism makes an angle of incidence (i) and deviates by angle as shown in the figure. Show that in the position of minimum deviation
Also find out the condition when the refracted ray QR suffers total internal reflection.
From the given figure, we have
Now, for the minimum deviation:-
We have,
then,
Hence, proved:-
To find the total internal reflection;
we have,