A convex lens of focal length 30 cm forms a real image three times larger than the object on a screen. Object and screen are mov

A convex lens of focal length 30 cm forms a real image three times larger than the object on a screen. Object and screen are moved until the image becomes twice the size of the object. If the shift of the object is 6 cm. The shift of screen is
A. 36 cm
B. 72 cm
C. 18 cm
D. 9 cm

A convex lens of focal length 30 cm forms a real image three times larger than the object on a screen. Object and screen are moved until the image bec

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