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 twicethe size of the object. If the shift of the object is 6 cm. the shift of screen is (7x) cm. find value of x

A convex lens of focal length 30 cm forms a real image three times lar

1.	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 twicethe size of the object. If the shift of the object is 6 cm. the shift of screen is (7x) cm. find value of x
Answer» ANSWER :4