Convex lenses bend light inward, and they correct farsightedness. The stronger the convex lens, the closer the focal point is to the lens. Concave lenses bend light outward, and are used to correct nearsightedness. The stronger the concave lens, the farther the focal point is from the lens.

This lens diverges the incident rays and these diverged rays can be converged by the lens in the eye to form the image on the retina. The focal length of a concave lens is negative, so a lens with negative power is required for correcting nearsightedness.

In myopia light rays are focused in front of the retina, so that a minus concave lens is needed to diverge the rays (Fig. ​ 5). In hypermetropia, it is the opposite, the rays are focused behind the retina so that a plus convex lens is needed (Fig.

A concave lens is used to diverge incident rays. This helps to create a virtual image on the opposite side of the refracting surface. Hence, these lenses are used in binoculars, telescopes, cameras, flashlights and eyeglasses.

There are numerous uses of the concave lens, like in telescopes, cameras, lasers, glasses, binoculars, etc.

• Concave Lens Uses. SpectaclesLasersCamerasFlashlightsPeepholes.
• Concave lens used in glasses.
• Uses of concave lens in lasers.
• Use of concave lens in cameras.
• Used in flashlights.
• Concave lens used in peepholes.

The Rest Three Uses of Concave Lens Are: Various devices like scanners, medical equipment, and CD and DVD players use laser beams. Since laser beams are highly-focused and we use small concave lenses to widen the laser beam to sharply access a specific area. Concave Lenses in Glasses.

The concave lens will not produce real images. Real images are not formed by a concave lens since the rays passing through the concave lens diverges and will never meet.

virtual image

A convex lens bends light rays inward, which results in the object being perceived as larger or closer. A concave lens bends rays outward; you get the perception that objects are smaller or farther away.

The concave lens is a diverging lens, because it causes the light rays to bend away (diverge) from its axis. In this case, the lens has been shaped so that all light rays entering it parallel to its axis appear to originate from the same point, F, defined to be the focal point of a diverging lens.

The droplets on a microscope slide are baked to set the shape. Smaller droplets allow higher magni២ cations. Telescopes and microscopes are excellent examples of how lenses are used every day. Telescopes are able to magnify images of very distant objects so we can see the details.

Prescription eyeglasses introduce refraction effects that change the wearer’s appearance. The eyes of a person wearing corrective lenses for nearsightedness (a) will appear smaller compared with (b) wearing nonprescription lenses, whereas the eyes of a person wearing lenses for farsightedness (c) will appear larger.