1. Which of the following can effect the point at which an image is formed by a convex lens? a.
Material the lens is made of b. Material surrounding the lens c. Radius of curvature of the lens d.
Diameter of the lens e. Size of the object being viewed f. Distance of the object being viewed
from the lens
Solution
The focal length of the lens depends on the refractive indices of Material surrounding the lens
and the material of the lens and the radius of curvature. The image distance depends on focal
length and the object distance. Hence the answer is all the options except Size of the object being
viewed and diameter of the lens.
The correct options are
a. Material the lens is made of
b. Material surrounding the lens
c. Radius of curvature of the lens
f. Distance of the object being viewed from the lens