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A converging lens is kept coaxially in contact with diverging lens--- both the lenses being of equal focal lengths. What is the focal length of the combination ? |
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Answer» Solution :Let focal length of converging LENS `f_(1) = +F` and focal length of diverging lens `f_(2) =-f`.If focal length of combination be `f_(EQ)`, then: `1/f_(eq) =1/f_(1) + 1/f_(2) =1/(+f) +1/(-f) =0` `rArr f_(eq) = OO` or `P_(eq) =0` |
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