Lesson: Chapter 5 — Optics

5.4.1. Convex lenses 3 of 5 Reset answers

Clear all your answers?

This erases every answer in this set and starts you again at question one. Your score will be gone.

Type these four numbers to confirm:

Those numbers don't match. Look at them again and type them.

Yes, clear Keep them

Question 3

How many foci does a lens have?

A Three B None C One D Two, one on each side, equally far from the optical centre

The right answer is the one marked above.

Two, one on each side, equally far from the optical centre. Light can fall on a lens from either side.

Answer the question to continue.