1.

Two lenses of focal legths f_(1) and f_(2) are kept in contact coaxially. The resultant power of combination willl be

Answer»

<P>`(f_(1)f_(2))/(f_(1) - f_(2))`
`(f_(1) + f_(2))/(f_(1)f_(2))`
`f_(1) + f_(2)`
`(f_(1))/(f_(2)) + (f_(2))/(f_(1))`

SOLUTION :` P = (1)/(f_(1)) + (1)/(f_(2)) = (f_(1) + f_(2))/(f_(1)f_(2))`


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