As an object is gradually moved from a very large distance (practically at infinity) to just beyond 2F in front of a convex lens, how does the position of its image change?
a) It shifts from the principal focus F towards the lens and finally coincides with the optical centre
b) It shifts from the principal focus F to a point beyond 2F on the opposite side of the lens
c) It shifts from the principal focus F to a position between F and 2F on the opposite side of the lens
d) It shifts from 2F to a point between F and the lens on the same side as the object