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Recent questions tagged refreaction-at-spherical-surfaces-and-lenses

A system of lens consists of two convex lenses of focal length $f_1= 30\;cm$ and $f_2 =20\;cm$. Separated by a distance 'd'. When a parallel beam of light is incident on the first lens after two refraction the resultant rays come out parallel then the distance 'd' is

asked Jan 22, 2014 by meena.p

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