Write any three applications of convex lens and concave lens
Answers
Answer: Convex
Used in magnifying glasses
One of the most direct and simplest uses of convex lens is in a magnifying glass. As the light rays enter the convex lens of the magnifying glass, it becomes focused to a specific focal point in front of the center of the lens. Once the magnifying glass is in the optimal distance. The focal point will reach the object, therefore maximum magnification of the object will be generated.
Convex lens used in eyeglasses
A person can become farsighted or nearsighted as the eye lens fails to focus the light on the retina properly. The lens of a person who is suffering from farsightedness focuses the image far behind the retina. Therefore it causes difficulty for the person to focus on the objects that are close to the eye. A convex lens, when placed in front of the eye, bends the light rays which shortens the focal point and the light focuses on the retina in a proper manner.
Uses of convex lens in cameras
Convex lenses are used widely in camera to not only focus an image but also to magnify it. Almost all lenses of cameras consist of a convex lens followed by a concave lens, followed by a second convex lens. The magnification level of the image is controlled by the first lens by moving away from or towards the object.
Used in microscopes
Microscopes use a convex lens to generate extremely magnified images of very small objects. Simple microscopes mostly consist of three lenses. The lens at the end of the simple microscope produces an inverted and magnified image.
Convave
Used in telescope and binoculars
Concave lenses are used in telescope and binoculars to magnify objects. As convex lens create blurs and distortion, telescope and binocular manufacturers install concave lenses before or in the eyepiece so that a person can focus more clearly.
Concave lens used in glasses
Concave lenses are most commonly used to correct myopia which is also called as nearsightedness. The eyeball of a person suffering from myopia is too long, and the images of faraway objects fall short of the retina. Therefore, concave lenses are used in glasses which corrects the shortfall by spreading out the light rays before it reaches the eyeball. This enables the person to see far away objects more clearly.
Uses of concave lens in lasers
Different types of scanners, medical equipments, and CD and DVD players use laser beams. As the laser beams are highly focussed, they are dispersed so that the equipment works in a proper manner. Small concave lenses are used which widen the laser beam to sharply access a specific area.
Use of concave lens in cameras
To improve the quality of photographs combinations of convex and concave lenses are widely used by camera manufacturers. When only a convex lens is used as the primary lens of a camera it causes distortions in the photos which is called chromatic aberrations. Combining both concave and convex lens eliminated the undesirable effects.
Used in flashlights
Concave lenses are also used in flashlights in order to magnify the light produced by the source. The light rays fall on the hollowed side of the lens, and the light rays diverge on the other side. This increases the radius of the light source and thus provides a wider beam.
Concave lens used in peepholes
Peepholes or door viewers are security devices that give a panoramic view if objects outside walls or doors. A concave lens is used minimizes the proportions of the objects and gives a wider view of the object or area.
Explanation: