Question

what is meant by power of a lens is - 2D​

Answer 1

Hey mate...... Here is the correct answer :

it means that the power of the lens is 2 diopter or 1 by f is equals to 2 d

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Answer 2

Power of a lens is the reciprocal of its focal length in metres.

If the power of a lens is -2D, it means that 1/f(in m) = -2D

FYI,

Since the focal length will be negative, this will be a concave lens.