What is the nature of the lens if its power is positive?

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Convex

Concave

Bifocal

None of these

answer is A.

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Detailed Solution

The nature of the lens is convex.
It is known that the power of a lens is the reciprocal of the focal length of the lens. Mathematically,

P = \frac{1}{f}

Where

f

is the focal length of the lens.
From the above relation, it can be said that the power is positive because the focal length is positive. Also, the convex lenses have a positive focal length. Hence, it can be said that the lens is convex as it has positive power.

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