(a) Figure below shows a parallel beam of monochromatic light incident on a convex sperical surface, radius of curvature `R=30` cm, which separates glass (refractive). Find the distance of image formed.
(b) A ray of light which is incident in air on the surface of a glass block is deviated through `15^(@)`. The angle of incidence in air is `60^(@)`. what is the angle of refraction in glass ? Also, claculate the critical angle for a glass-air interface.

Explanation

(a) From the relation `(n)/(v)-(1)/(u)=(n-1)/(R)` calculate v.
(b) Calculate it from `"_(a)mu_(g)=(sin((delta_(m)+A)/(2)))/(sin(A//2))and._(a)mu_(g)=(1)/(sini_(c ))`