A convex lens makes a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object

A convex lens makes a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is 16 cm tall. The length of the object must be
A. `1//4 cm`
B. `8 cm`
C. `12 cm`
D. `20 cm`

A convex lens makes a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real

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