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Focal length of two lens arefandf^(')ans...

Focal length of two lens are`f`and`f^(')`ans dispersive powers are `omega_(0)`and`2omega_(0)`.To form achromatic combination from these-
(1)`f^(')=2f ,(2) f^(')=-2f` (3)`f^(')=-f//2`

Text Solution

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For achromatic combination
`(omega)/(omega')=-(omega)/(omega')`
`(omega)/(omega')=(omega_(0))/(2omega_(0))=(1)/(2)`
`-(f)/(f')=(1)/(2)` or f'=-2f
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