The distance between two sources of light is 24 cm.Find out where would you place a converging lens of focal length 9 cm,so that the images of both sources are formed at the same point.

Where should an object placed from a conveging lens of focal length 20 cm,so as to obtain a real image of magnification 2?

At what distance should be placed from a convex lens of focal length 15 cm to obtain an image three times the size of the object?

If the distance between the screen and object is 50 cm and the displacement of the lens is 10 cm,clculate the focal length of the lens.

Calculate the distance at which an object should be placed in front of a convex lens of ocal length 10 cm,so as to obtain an image twice the size of the object?

An object is placed at a distance of 75 cm from a screen .Where should a convex lens of focal length 12 cm be placed so as to obtain on the screen?

An object 5 cm in length is held 25cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of image formed

An object of 3 cm height is placed at a distance of 60 cm from a convex mirror of focal length 30 cm.Find the position and size of the image formed.

An object of size 5 cm is placed at distance of 25 cm in front of a convex lens of focal length 20 cm. Find the size and nature of image and its distance from the lens.

A card sheet divided into squares each of size 1 mm^2 is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held close to the eye. What should be the distance between the object in converging lens and the magnifying glass if the virtual image of each square in the figure is to have an area of 6.25 mm^2 . Would you be able to see the squares distinctly with your eyes very close to the magnifier ?