Ra: Pass Question 31. The focus distance of a convex lens is 50 cm. How far away does it have to be from the lens to get a twice-real image of an object? (2012,14,180

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 ? .

An object is placed at a distance of 15 cm from a convex lens. If the focal length of the lens is 60 cm, find the image distance.

Where should an object be placed in front of a convex lens to get a real to get real image of the size of the object ?

Where should an object be placed in front of a convex lens to get a real to get real image of the size of the object ?

How far from a convex lens of focal length 20 cm would you place an object to get a real image enlarged three times ?