A convergent beam of light converges to a point `20 cm` behind the convex mirrorr on the principal axis.An inverted image of the same size is formed coincident with the virtual object. Then, the focal length of the convex mirrorr is

A convergent beam of light is incident on a convex mirror so as to converge to a distance 12 cm from the pole of the mirror. An inverted image of the same size is formed coincident with the virtual object. What is the focal length of the mirror ?

A beam of light converges towards a point O, behind a convex mirror of focal length 20cm. Q. Similarly, as in above question when point O is 30cm behind the mirror.

A beam of light converges towards a point O, behind a convex mirror of focal length 20cm. Q. Find the magnification and nature of the image when point O is 10cm behind the mirror.