Question

a lens has a power -2. 5D.what is the focal length and nature of the lens​

Answer 1

Answer :-

As the focal length is positive, it is a convex lens.

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Answer 2

Answer:

Focal length = -0.4 m

Nature of lens - Concave lens

Explanation:

Power of the lens = -2.5 D

Focal length of lens = 1/P

= 1/-2.5

= - 0.4 m

Since the focal length is negative the lens is a concave lens