Use of Convex Lenses

A convex lens with small focal length produces a virtual, erect and bigger image of an object as shown in the figure. Such a lens is called simple microscope or magnifying lens.

"A compound microscope is made of two convex lenses: objective and eyepiece."

Telescope is used to see distant objects clearly in their magnified form.

The telescopes used to observe astronomical sources like the stars and the planets are called astronomical telescopes.

• A simple microscope uses a convex lens to show a bigger, erect image of nearby objects.
• A compound microscope uses two convex lenses to achieve high magnification of tiny objects, such as cells.
• In compound microscopes, the objective has a small focal length, and the eyepiece has a longer focal length.
• Telescopes use convex lenses to magnify distant objects, such as stars; the objective collects light, and the eyepiece magnifies it.
• Convex lenses are also used in cameras, projectors, and spectrographs for focusing and image formation.