1.

Whentheconvex side of the plano - convex lens is silvered, it behaves like:

Answer»

CONCAVE mirror of focal length `(f)/(2)`
Convex mirror of focal length `(f)/(2)`
Concave mirror of focal length `(R )/(2mu)`
Convexmirror of focal length `(R )/(2mu)`.

Solution : `(1)/(f) = (mu - 1) ((1)/( R) - (1)/(oo)) = (mu - 1)/(R )`
and `f_(m) = (2)/(R_(m)) = (2)/(R )`
Now `"" (1)/(F) = (2)/(f) + (1)/(f_(m)) = 2((mu-1)/(R)) + (2)/(R )`
`(1)/(F) = (2mu)/(R) (+ve)`
`THEREFORE "" F = (R )/(2mu)`
Mirror is convex mirror of
`F = (R )/(2mu)`.


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