Sign convention — task. Physics CBSE Live product, Class 10 (2026-27).

Choose the best answer:

1. The focal length of a concave lens is

negative
zero
positive
infinite

2. A virtual image formed by a convex lens will have

negative \(v\) and positive \(f\)
negative \(v\) only
positive \(v\) and negative \(f\)
positive \(f\) only

Login or Fast registration

Exit to the topic

Did you find an error?