You are given two converging lenses to build a compound microscope. Lens A has focal length 0.50 cm and lens B has focal length of 3.0 cm. Which one of the two lenses would you use for the
Objective?
A) Lens B, because it has the longer focal length.
B) Lens A, because it has the shorter focal length.
C) It makes no difference which lens I use for the objective.
D) None, because the objective should be a diverging lens.

Question

Quizplus · Accepted Answer

The objective lens of a compound microscope is the lens closest to the object being viewed and requires a short focal length to provide a high magnification. Therefore, Lens A, with the shorter focal length of 0.50 cm, is the correct choice for the objective.

You Are Given Two Converging Lenses to Build a Compound