Find the power of a concave lens of focal length 2 m .
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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).
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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 and 1D = 1m-1. Therefore, the correct answer for the given question is option
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