Question

Write the applications of convex and concave lenses in daily life with neat ray diagram

Answer 1

Answer:

Convex lens:

A convex lens or converging lens is one that is thicker at the centre. It is also called a positive lense. When light rays pass through a convex lens, the refracted rays converge at one point. That point is called the principal focus. The convex lens produces a real image and is mostly used to magnify the objects.

Uses of Convex lens:

1. Convex lens is widely used as a magnifying glass.
2. People who are suffering from farsightedness use convex lenses in glasses to rectify their eyesight.
3. In cameras multiple convex lenses are used to magnify the image and to focus, followed by concave lenses.
4. The convex lenses are used in microscopes to enlarge the sizes of the minuscule objects.

Concave lens:

A lens that is hollowed inward or curved in is called a concave lens. A concave lens is also known as a negative lens and a diverging lens. When light rays fall on a concave lens; these bend outward and diverge. The image formed upright but smaller than the actual image.

Uses of concave lens:

1. In order to improve the focus, concave lenses are placed in binoculars and telescopes before the convex lenses.
2. Concave lenses are used in glasses to correct the nearsightedness or myopia.
3. In lasers, small concave lenses are used to widen the laser beam.
4. Camera manufacturers use concave lenses in combination with convex lenses to improve the quality of photographs. Convex lenses alone produce distortion in photos, which is called chromatic distortion.
5. Concave lenses are used in flashlights to magnify the light produced by the light source.
6. The widest use of concave lenses is peephole.

Hope it has answered your question.

Answer 2

Uses of Convex lens in our daily life:

• It is used as magnifying glass by different people like palmist , watch repairer etc
• used in spectacles to correct Hypermetropia eye defect.
• used in camera
• used in making of optical instruments like compound microscope.

Uses of Concave lens  in our daily life:

• used in spectacles to correct the eye defect Myopia .
• used in doors as spy hole or peep hole
• used in making of optical instruments like telescope