(a) A convex lens of focal length 50 cm
(b) A concave lens of focal length 50 cm
(c) A convex lens of focal length 5 cm
(d) A concave lens of focal length 5 cm
Answer –
The correct option is (c).
When an object is put between the radius of curvature and the focus of a convex lens, the object on the opposite side of the lens is magnified.
The magnification of the convex lens is greater when the focal length is shorter. As a result, a convex lens with a shorter focal length will be used to read the small letters.