# A thin lens has a focal length of - 25 cm. What is the power of the lens? It is convex or concave ?

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A thin lens has a focal length of - 25 cm. What is the power of the lens? It is convex or concave ?

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Correct Answer - - 4 D ; concave
Here, f = - 25 cm, P = ?
From P = 100/f = 100/(-25) = -4 D. Negative sign shows that the lens is concave.