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Q.

An eye specialist prescribes spectacles having a combination of a convex lens of focal length 40 cm in contact with a concave lens of local length 25 cm. The power of this lens combination in dioptre is

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answer is -1.5.

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Detailed Solution

Power of the lens combination is

P=P1+P2=1f1( in m)+1f2( in m)                    =1+0.40m+1−0.25m                    =−1.5m−1x  =−1.5D,

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