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

Select the best answer:

1. The focal length associated with a convex lens is

can be both
zero
always negative
always positive

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

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

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