[" for the st maracteristics of the image formed by a concave lens of "],[" List lingth 20cm when the object is placed at a distance of 40em "],[" from its optical centre."]

List four characteristics of the image formed by a convex lens of focal length 20 cm when the object is placed in front of it is a distance of 10 cm from its optical centre .

List four characteristics of the image formed by a concave mirror of focal length 40 cm when the object is placed in front of it at a distance of 20 cm from its pole.

List four characteristics of the image formed by a concave mirror of focal length 40 cm when the object is placed in front of it at a distance of 20 cm from its pole.

When an object is placed at a distance of 36 cm from a convex lens, an image of the same size as the object is formed. What will be the nature of image formed when the object is formed. What will be the nature of image formed when the object is placed at a distance of: a) 10 cm from the lens? b) 20 cm from the lens?

The same size images are formed by a convex lens when the object is placed at 20cm or at 10cm from the lens. The focal length of convex lens is ____ cm