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  4. An object is placed at the focus of a convex mirror. If its focal length is 20 cm, the distance of mirror is

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Q. An object is placed at the focus of a convex mirror. If its focal length is $20\, cm,$ the distance of mirror is

Bihar CECEBihar CECE 2009Ray Optics and Optical Instruments

Solution:

$f$ is +ve for convex mirror.
Therefore, for convex mirror
$\frac{1}{v}-\frac{1}{20} =+\frac{1}{20}$
$\frac{1}{v} =\frac{1}{10}$
or $v =10\, cm$