Question

find
the power of concave lens
of focal length 2m​

Answer 1

Explanation:

The given focal length of the concave lens is f = -2 m. It is negative because a concave lens always has a negative focal length. The unit of power is dioptre (D) and 1D = 1m-1. Therefore, the correct answer for the given question is option (D).

Answer 2

Answer:

Given that, Focal length of the concave lens, f = 2 m.

To find, Power of the lens.

Solution, The relation between power and focal length of the lens is inverse. Power is given by : P = 1/f.

f is the focal length of the lens and it is negative for concave lens.

Explanation:

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