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A convex lens of focal length 30 cm is p...

A convex lens of focal length 30 cm is placed coaxially in contact with a concave lens of focal length 40 cm. Determine the power of the combination. Will the system be converging or diverging in nature?

Text Solution

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Power of convex lens, `P_(1)=(100)/(30)=(10)/(3)D`
Power of concave lens, `P_(2) =(-100)/(40)= -2.5D`
Power of the combination, `P=P_(1)+P_(2)=(10)/(3)-(10)/(4)=(5)/(6)D`
In nature it is converging.
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