Question

A convex lens of ____ focal length gives a greater magnification than lenses of ____ focal length.

• A. Long, short
• B. Short, equal
• C. Equal, short
• D. Short, long

Answer 1

The correct option is D Short, long

$Power=\frac{1}{focallength}$
To achieve large magnification, you need either a really short focal length eye lens or a really long focal length objective. It is much more difficult to manufacture high quality short focal length lenses than it is to manufacture high quality long focal length lenses.