why convex lens has a positive power?
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The power of a convex lens is positive as a convex lens has a positive focal length, while the power of a concave lens is negative as concave lens has a negative focal length.
It is because focal length of convex lens is +ve and. Since P=1/f. Therefore power of convex lens is positive.
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ananya7921:
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The power of a convex lens is positive as a convex lens has a positive focal length, while the power of a concave lens is negative as concave lens has a negative focal length.
It is because focal length of convex lens is +ve and. Since P=1/f. Therefore power of convex lens is positive.
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