Since the light sources are very far away, the incoming light rays are effectively parallel. The concave mirror focuses the light rays on a flat mirror, kept at its focal distance.
Due to the convergence, the intensity of the light incident on the flat mirror increases. Then the reflection of the flat mirror is seen through the eyepiece. Microscopes: A concave mirror is used in the base of a microscope as a condenser.
The light from an external source is shone on the specimen, after being passed through the mirror. The concave mirror concentrates the light on the specimen only to ensure that the surroundings are relatively dark. The orientation of the mirror can be changed by rotating it. The specimen is seen through an eyepiece. Headlights and Torches: The bulb of a headlight or a torch is placed at the focus of a concave mirror.
The light rays, coming from the bulb, emerge out as parallel rays after getting reflected at the concave mirror. The reflected rays can cover large distances with high intensity. Every observer would observe the same image location and every light ray would follow the law of reflection. Yet only two of these rays would be needed to determine the image location since it only requires two rays to find the intersection point.
Of the five incident rays drawn, two of them correspond to the incident rays described by our two rules of reflection for concave mirrors. Because they are the easiest and most predictable pair of rays to draw, these will be the two rays used through the remainder of this lesson. The method for drawing ray diagrams for concave mirror is described below. The method is applied to the task of drawing a ray diagram for an object located beyond the center of curvature C of a concave mirror.
Yet the same method works for drawing a ray diagram for any object location. Pick a point on the top of the object and draw two incident rays traveling towards the mirror. Once these incident rays strike the mirror, reflect them according to the two rules of reflection for concave mirrors. Mark the image of the top of the object. Repeat the process for the bottom of the object. Some students have difficulty understanding how the entire image of an object can be deduced once a single point on the image has been determined.
If the object is a vertically aligned object such as the arrow object used in the example below , then the process is easy. The image is merely a vertical line. In theory, it would be necessary to pick each point on the object and draw a separate ray diagram to determine the location of the image of that point. That would require a lot of ray diagrams as illustrated below.
Fortunately, a shortcut exists. If the object is a vertical line, then the image is also a vertical line. For our purposes, we will only deal with the simpler situations in which the object is a vertical line that has its bottom located upon the principal axis.
For such simplified situations, the image is a vertical line with the lower extremity located upon the principal axis. The ray diagram above illustrates that when the object is located at a position beyond the center of curvature, the image is located at a position between the center of curvature and the focal point.
Furthermore, the image is inverted, reduced in size smaller than the object , and real. The concave mirrors help dentists to see the interior mouth or teeth acutely. Concave mirrors are used to absorb the sunlight at the focus point. This absorbed sunlight in the solar furnace produces heat. This concentrated heat energy is used for cooking, electricity, heating, and other purposes. Concave mirrors are widely used in reflecting telescopes in observational astronomy.
Since the concave mirrors are converging mirrors, the intensity of the light increases. A concave mirror is used as a base in the microscope as a condenser. This helps the mirror to concentrate the light passed through it to make sure the surroundings of the object are dark.
Due to the reflective and curved surface, concave mirrors are used as shaving and makeup mirror. When the concave shaving mirror is held closer to the face, the mirror enlarges and produces an erect image. Make use of the following free study materials from Embibe which will definitely help you in your exams:. November 16, at pm. Huzaifa says:.
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