At what distance should the converging lens of focal length 10 cm be held in order to view the squares distinctly with the maximum possible magnifying power?

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?

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 9 cm) held close to the eye. What is the angular magnification (magnifying power) of the lens?

A figure divided into squaes each of size 1 mm^2 is being viewed at a distance of 9 cm through magnifying lens of focal lengh 10 cm, held close to the eye. Draw the ray diagram showing the formation for the image.

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 ?

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 focal length 10 cm) held close to the eye. What is the magnification produced by the lens? How much is the area of each square in the virtual image?

A luminous object is placed at a distance of 30 cm from the convex lens of focal length 20 cm.On the other sie of the lens,at what distance from the lens,a convex mirror of radius of curvature 10 cm be placed in order to have an upright imae of the object coincident with it?

A detective uses a converging lens of focal lenth 12 cm to examine the fine details of some cloth fibers found at the scene of a crime. What is the maximum magnification given by the lens?

Two thin converging lenses of focal lenths 15 cm and 30 cm are held in contact with each other.Calculate power and focal length of the combination.