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A convex lens of focal length 25 cm is p...

A convex lens of focal length 25 cm is placed coaxially in contact with a concave lens of focal length 20 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 `= 1// 0.25 = 4 D`
Power of concave lens `= - 1 / 0.20 = - 5D`
Power of the combination, `P = P_(1) + p_(2) = -1D`
Nature `:` Diverging
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