A magnifying glass is to be used at the fixed object distance of 1 inch. If it is to produce an erect image magnified 5 times its focal length should be

A magnifying glass of focal length f used to see an object placed at a distance u from it forms the virtual image at the least distance of distinct vision D. its magnifying power is given by

An object is placed at 20 cm in front of a concave mirror produces three times magnified real image. What is focal length of the concave mirror ?

An object placed at 20cm in front of a concave mirror produces three times magnified real image. What is the focal length of the concave mirror?

An object placed at 20cm in front of a concave mirror produces three times magnified real image. What is the focal length of the concave mirror?

A convex mirror of focal elongth f produces an image magnified m times.The distance of the object from mirror is

If the distance between object and its two times magnified virtual image produced by a curved mirror is 15 cm, the focal length of the mirror must be :

Find the distance of an object from a convex lens if image is two times magnified. Focal length of the lens is 10cm

Find the distance of an object from a convex lens if image is two times magnified. Focal length of the lens is 10cm

Find the distance of an object from a convex lens if image is two times magnified. Focal length of the lens is 10cm