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A converging and a diverging of equal fo...

A converging and a diverging of equal focal length are placed co-axially in contact. Find the focal length and power of the combination.

Text Solution

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Let f and -f are be the focal length of the converging and diverging lens respectively then focal length of the combination 1/F = 1/f- 1/f = 0
power of the combination p=1/F=0
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