study the given diagram in which a convex lens forms a virtual image of an object placed at a distance of 10 cm from it. the focal length of the lens must be
a equal to 10cm
b greater than 10cm
c less than 10cm

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Solution

Convex lens forms the virtual image when object is kept between the focal length and the radius of curvature of the mirror.
Hence focal length is less than the 10 cm.

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