Question

which lens is used if it's 'D'value is negative​

Answer 1

Answer:

The focal length of a convex lens is positive and that of a concave lens is negative. We know that power of a lens is given as (1 / f). Thus, for the convex lens, if the focal length is positive than the power is also positive. Similarly, for the concave lens, the power is negative

Answer 2

Answer:

The focal length of a convex lens is positive and that of a concave lens is negative. We know that power of a lens is given as (1 / f). Thus, for the convex lens, if the focal length is positive than the power is also positive. Similarly, for the concave lens, the power is negative.

Explanation:

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