At what distance from a converging lens of focal length 12 cm must an object be placed in order than an image of magnification 1 will be produced?

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

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

At what distance an object must be placed from a lens of focal length 15 cm to get an inverted image of unit magnification ?

Determine how far an object must be placed in front of a converging lens of focal length 10 cm in order to produce an erect (upright) image of linear magnification 4.

An object is placed 80 cm from converging lens of focal length 25 cm. What is the nature of image?

At what distance should an object be placed from a convex lens of focal length 18 cm to obain an image at 24 cm from it one the other side? What will be the magnification produced in this case?

An object is placed at a distance of 100 cm from a converging lens of focal length 40 cm. i) What is the nature of image? ii) What is the position of image?