A light ray of yellow colour is incident on an equilateral glass prism at an angle of incidence equal to `48^(@)` and suffers minimum deviation by an angle of `36^(@)`. (i) What will be the angle of emergence ?
(ii) If the angle of incidence is changed to (a) `30^(@)`
(b) `60^(@)`, state in each case whether the angle of deviatioin will be equal to, less than or more than `36^(@)`. ?

Answer

(i) `48^(@)`
(ii) (a) more than `36^(@)`
(b) more than `36^(@)`.