1.

One side of the biconcave lens is silvered. It behaves like :

Answer»

Convex mirror or `f = (R )/(2MU)`
Concave mirror of `r = ( R)/(2mu)`
Convex mirror or FOCAL length `(R )/( 4mu - 2)`
Concave mirror of focal length `(R )/(4mu - 2)`

Solution :(d) `(1)/(F)=-(1)/(f)-(1)/(f)-(1)/(f_(m))=-(2)/(f)-(1)/(f_(m))=-[(2)/(f)+(1)/(f_(m))]`
`=-[(4(mu-1))/(R)+(2)/(R)]=-(4mu-2)/(R)`
`therefore `F = - ( R) = - (R )/(4mu - 2)` so it bahaves like a concave mirror


Discussion

No Comment Found

Related InterviewSolutions