A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the lens, in the which ways (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected ? .

A 4 cm tall object is placed on the principal axis of a convex lens. T

1.	A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the lens, in the which ways (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected ? .
Answer» (a) The screen should be moved towerds the lens to get a sharp image of the object again. (b) Magnification of the image decreases on moveing the object away from the lens.

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