Power of Convex lens of focal length25cm
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Power is expressed as the inverse of focal length, where a focal length of 1 meter is equal to one diopter. ... A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm.
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Convex lens has focal length in positive.
P=1/f
=100/25
=4Dioepters
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