Question

Name the type of the lens if its power is -2.OD. find the focul length of this lens ​

Answer 1

Answer:

avatal lance

Explanation:

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Answer 2

Answer:

If the power of the lens is negative then it is a concave lens.

Explanation:

The power of a lens is defined as the inverse of its focal length.

Power = 1 / focal length

        P = 1 / f

Given the power of the lens, P = -2 D

∴ Focal length of the lens, f = 1 / P

                                              = 1 / -2

                                              = -0.5 m

So the focal length of the lens has a negative value. A concave lens always has a negative value of focal length. So the lens is concave.