Difference Between Concave And Convex Mirrors PdfBy Sentmahmossle In and pdf 21.01.2021 at 20:24 4 min read
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- What is the difference between Concave and Convex mirror?
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- Curved mirror
What is the difference between Concave and Convex mirror?
A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex bulging outward or concave recessed inward. Most curved mirrors have surfaces that are shaped like part of a sphere , but other shapes are sometimes used in optical devices. The most common non-spherical type are parabolic reflectors , found in optical devices such as reflecting telescopes that need to image distant objects, since spherical mirror systems, like spherical lenses , suffer from spherical aberration. Distorting mirrors are used for entertainment. They have convex and concave regions that produce deliberately distorted images. They also provide highly magnified or highly diminished smaller images when the object is placed at certain distances.
A concave mirror has the reflecting surface that caves inwards. Concave mirrors converge light to one prime focus point. Therefore, they are also called converging mirrors. They are used to focus light. The image formed by a concave mirror varies in size depending on the position of the object with respect to the mirror.
As the angle of incidence is increased for a ray incident on a reflecting surface, the angle between the incident and reflected rays ultimately approaches what value? The angle of incidence is the angle between the incident ray and the normal. As this angle approaches 90 degrees, the reflected ray also approaches a 90 degree angle with the normal; thus, the angle between the incident and reflected ray approach degrees. If you stand three feet in front of a plane mirror, how far away would you see yourself in the mirror? If you stand 3 feet from the mirror, then your image is three feet on the other side of the mirror; this puts your image a total of six feet from you 3 feet to the mirror plus 3 more feet to the image. A concave mirror with a focal length of
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Mirror refers to any smooth polished or shining surface, that can reflect the light beam and form images. It can be of two types, i. The mirror whose reflecting surface is flat is a plane mirror whereas a mirror with the curved reflecting surface is termed as a spherical mirror. A spherical mirror is of two types, i. A convex mirror has a reflecting surface that bulges outside. The main difference between a convex and concave mirror lies in the image formed by the two mirrors, i. Basis for Comparison Convex Mirror Concave Mirror Meaning Convex mirror implies the mirror whose reflecting surface is away from the center of curvature.
We will examine here the difference between concave and convex mirrors. After that, we will get an idea about the types of mirrors, and different types of images formed by these lenses. First, we will study all the keywords related to the mirrors so that we can learn their meanings. This will help us understand the topic better. The direction of the light gets changed when it falls on an object.
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We only have to look as far as the nearest bathroom to find an example of an image formed by a mirror. Images in flat mirrors are the same size as the object and are located behind the mirror. Like lenses, mirrors can form a variety of images. For example, dental mirrors may produce a magnified image, just as makeup mirrors do.
The properties of spherical mirrors are discussed as we learn such terms as center of curvature, focal point, and principal axis. The properties of images formed by concave and convex mirrors are examined through ray diagrams. Plan and carry out investigations to characterize the properties and behavior of electromagnetic waves.
Predating even crude lenses, mirrors are perhaps the oldest optical element utilized by man to harness the power of light. Prehistoric cave dwellers were no doubt mesmerized by their reflections in undisturbed ponds and other bodies of water, but the earliest man-made mirrors were not discovered until Egyptian pyramidal artifacts dating back to around BC were examined. Mirrors made during the Greco-Roman period and the Middle Ages consisted of highly polished metals, such as bronze, tin, or silver, fashioned into slightly convex disks, which served mankind for over a millennium. It was not until the late Twelfth or early Thirteenth Centuries that the use of glass with a metallic backing was developed to produce looking glasses , but refinement of this technique took an additional several hundred years.
Optical lenses are polished glass or plastic substrates that are shaped with one or more curved surfaces that transmit light. Optical lenses may be used either uncoated or with an antireflective coating depending on their intended application. All optical lenses have a focal length which is the distance from the lens to the focal point along the optical axis of the lens. Three factors determine the focal length of a lens; the radius of curvature of the lens, the refractive index of the substrate from which the lens is made, and the medium in which the lens resides. Lenses that are highly curved and made from material with a high refractive index, and placed in a medium with a large difference in the refractive index will have a shorter focal length and will therefore be more powerful. Convex lenses bulge outward from the center and converge light rays parallel to the optical axis to a focal point beyond the lens.
There are, again, two alternative methods of locating the image formed by a convex mirror. The first is graphical, and the second analytical. According to the graphical method, the image produced by a convex mirror can always be located by drawing a ray diagram according to four simple rules: An incident ray which is parallel to the principal axis is reflected as if it came from the virtual focus of the mirror. An incident ray which is directed towards the virtual focus of the mirror is reflected parallel to the principal axis.
In the first section of Lesson 4 , we learned that light is reflected by convex mirrors in a manner that a virtual image is formed. We also learned that there are two simple rules of reflection for convex mirrors. These rules represent slight revisions of the two rules given for concave mirrors.
Танкадо, как и остальные сотрудники шифровалки, работал над проектом ТРАНСТЕКСТА, будучи уверенным, что в случае успеха эта машина будет использоваться для расшифровки электронной почты только с санкции министерства юстиции. Использование ТРАНСТЕКСТА Агентством национальной безопасности должно было регулироваться примерно так же, как в случае ФБР, которому для установки подслушивающих устройств необходимо судебное постановление. Программное обеспечение ТРАНСТЕКСТА по раскрытию кодов должно храниться в Федеральной резервной системе и министерстве юстиции. Это должно было гарантировать, что АНБ не сможет перехватывать частную переписку законопослушных граждан во всем мире.