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A converging lens is kept coaxially in contact with a diverging lens, both the lenses being of equal focal lengths. What is the focal length of the combination? |
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Answer» SOLUTION :`(1)/( f) = ( 1)/( f_(1)) + ( 1)/( f_(2))` `= ( 1)/( f_(1)) + ( 1)/( -f_(2)) ``( :. f_(1) = - f_(2))` `RARR f = OO` |
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