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A plano concave lens is silvered at the ...

A plano concave lens is silvered at the plane surface. How does it behave?

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It behaves like a convex mirror.
Note: `(1)/(F)= - (1)/(f)+(1)/(f_(m))- (1)/(f)`
`(1)/(F)= (2)/(f)" " because r =oo, f_(m)=oo` for a plane surface `F=(-f)/(2)`
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