(a) A point object 'O' is kept in a medium of refractive index (5 marks)
n1 in front of a convex spherical surface of radius of curvature
R which separates the second medium of refractive index n2
from the first one, as shown in the figure.
Draw the ray diagram showing the image formation and deduce
the relationship between the object distance and the image distance
in terms of n1, n2 and R.
(b) When the image formed above acts as a virtual object for concave
spherical, surface separating the medium n2 from n1 (n2 > n1), draw
this ray diagram and write the similar (similar to (a)) relation. Hence
obtain the expression for the lens maker's formula.