4. Power of a lens is -2.0D.
(1 Point)
O its focal length is -0.5m and it is a concave lens
O its focal length is +0.5m and it is a concave lense
O its focal length is -0.5cm and it is a concave lens
O its focal length is -2m and it is a convex lens
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The correct answer is
its focal length is -0.5 and it is a concave lens
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its focal length isi-0.5m and it is a concave lens
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