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प्रश्न
A converging lens is kept coaxially in contact with a diverging lens – both the lenses being of equal focal length. What is the focal length of the combination?
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उत्तर
The focal length of the lenses is f and −f.
We know that the equivalent focal length of a combination of lenses is
`1/f_e""=1/f_1""+1/f_2""=1/f-1/f=0`
`:.f_e = oo`
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