At what distance an object to be kept from a convex lens so that its image will be equal in size?

If an object is moved towards a convex lens, the size of its image-

At what distance an object be kept to get magnified, real image? Draw schematic diagram.

A real image formed by a convex lens is always-

At what distance in front of a concave mirror (f = 10m) an object is to be placed so that the size of the image will be halved of the size of the object?

At what distance from a concave mirror an object should be placed to get an image half the size of the object?

If an object is placed at a distance of 5 cm from a convex lens, a real image of the object is formed at a distance of 20 cm from the lens . If the lens is used as a magnifying glass what maximum magnification can be obtained from it ? Least distance of distinct vision is 24 cm .

An object is placed 20 cm from a convex lens of focal length 10 cm. The image must be-

The length of an object is 5 cm. An image of length 10cm is obtained when it is placed at a distance of 2 cm in front of a convex lens. What is the linear magnification and image distance?