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A plano- convex lens of focal length 40c...

A plano- convex lens of focal length 40cm and refractive index `mu`=1.5 is silvered at the curved surface .It will behave in air as a
1) concave mirror of focal length 20cm
2) concave mirror of focal length `(20)/(3)cm`
3) convex mirror of focal length`(20)/(3)cm`
4) convex mirror of focal length`(10)/(3)`cm

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