a student use a lens of focal length 40cm ans another -20 cm write the nature and powwr of each lens.
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I don't no this question . sorry
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Power of 1st lens is
p=1/f
=1/0.4
=2.5 D (convex lens)
Power of 2nd lens is
P= 1/f
= 1/-0.2
= -5D ( concave lens)
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