Question

Negative power indicates that it is not a:

• A. Concave lens
• B. Convex lens
• C. Combination of both the lenses
• D. None of these

Answer 1

Answer: (B), (C), (D)

The correct options are
B

Convex lens

C

Combination of both the lenses

D

None of these

The power of a lens is its ability to bend light – the greater the power the greater the refraction of light. It is equal to the reciprocal of the focal length of the device: $P=\frac{1}{f}$.
The power of a convex lens is positive as a convex lens has a positive focal length, while the power of a concave lens is negative as the concave lens has a negative focal length.