A convex lens is kept in contact with a concave lens of same focal length.The focal length of the equivalent lens is -180cm.Calculate the power of combination?
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Explanation:
Power of combination=1/F1+1/F2
=1/180cm-1/180cm
=0cm
It means that the combination has no focal length( the rays of light will just pass through the combination of lens without any devieation
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