A magnifying glass is a converging lens placed close to the eye. A farsighted person uses spectacles having converging lenses. Compare the functions of a converging lens used as a magnifying glass and as spectacles.

concave lens is used as 'magnifying lens'.

A card sheet divided into squares each of size 1 mm^(3) viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 9 cm ) held close to the eye. a. What is the magnification produced by lenas ? How much is the area of each square in the virtual image ? b. What is the angular magnification (magnifying power ) of the lens ? c. Is the magnification in (a) equal to the magnifying power in (b)? explain.

The magnifying power of a converging lens used as a simple microscope is (1+D/f) . A compound microscope is a combination of two such converging lenses. Why don't we have magnifying power (1+D/f_0)(1+D/f_e) . In other words, why can the objective not be treated as a simple microscope but the eyepiece can?

Selwyn is 16 yr old and wears a spectacle having a power of +2 D. Answer the following questions: Which lens is used by selwyn?

When a person uses a convex lens as a simple magnifying glass, the object must be placed at a distance __________.

A person is viewing an extended object. If a converging lens is placed in front of his eyes, will he feel that the size has increased?