the focal length of a spherical lens is -2m. Its power and nature of lens are
a) -0.5D convex
b) 0.5D concave
c) -0.5D concave
d) 0.5D convex
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Answer:
Concave lens has negative and concavo-convex lens can have negative focal length.
But, convex lens always has positive focal length.
Explanation:
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