Question

Which part of the bi-focal lens should a person use to read? And why?

• A. The lower part, since it facilitates distinct vision.
• B. The upper part, since it facilitates near vision.
• C. The lower part, since it facilitates near vision.
• D. The upper part, since it facilitates distant vision.

Answer 1

The correct option is C

The lower part, since it facilitates near vision.

To read, the person should use the lower part i.e. convex lens since it facilitates the near vision.