the labelled diagram for the formation of the image of the following position 1) formation by concave mirror when the object is placed between pole and focus 2)when the object behind centre of curvature of the concave mirror 3) when the size of the image and size of the object are equal in case of the convex lens
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wheer is the image???
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Concave and Convex Mirrors – Ray Diagrams, Image Formation, Applications
Light is responsible for anything around us visible. This happens when light rays are reflected to the observer from the source object. For a good reflection, the light source must be a polished or shiny surface that acts as a mirror. This is due to the phenomenon called reflection of light which does not intend to change the velocity of light it only reverses the direction of light incident on it. In order to obtain a good reflection of light, the surface chosen for the same must be spherical, smooth & shiny. Therefore, the mirror that is known as a spherical mirror is made out by cutting out a hollow spherical glass ball. A spherical mirror has a reflecting surface that can be inside or outside, it depends on the purpose of use.
Spherical Mirrors
The curved surface we see of a shining spoon can be considered as a curved mirror. The most widely used type of curved mirror is the spherical mirror. The reflecting surface of such mirrors is considered to form a part of the surface of any sphere. Those mirrors which possess reflecting surfaces which are spherical are called spherical mirrors.
Types of Spherical Mirrors
Spherical Mirrors are categorized into two types:
Concave Mirrors
Convex Mirrors
Concave Mirror
If a hollow sphere is cut into some parts and the outer surface of the cut part is painted, then it turns out to be a mirror with its inner surface as the reflecting surface. This makes a concave mirror.
A concave mirror or converging mirror is a type of mirror that is bent towards the inwards side in the middle. Moreover, by looking in this mirror, we will feel that we are looking in a cave. We tend to use the mirror equation to deal with a concave mirror.
The equation for these mirrors determines position of the object and the accurate size of the object. The angle of incidence in the concave mirror is not same as the angle of reflection. Moreover, the angle of reflection in this case depends on the area on which the light hits.
Properties of Concave Mirrors:
Light after reflection converges at a point when it strikes and reflects back from the reflecting surface of the concave mirror. Hence, it is also termed as converging mirror.
When the converging mirror is placed very near to the object, a magnified and virtual image is observed.
But, if we tend to increase the distance between the object and the mirror then the size of the image reduces and a real image is formed.
The image formed by the concave mirror can be small or enlarged or can be either real or virtual.
Applications of Concave Mirrors:
Used in shaving mirrors: Converging mirrors are most widely used in shaving because they have reflective and curved surfaces. At the time of shaving, the concave mirror forms anenlarged as well as an erect image of the face when the concave mirror is held closer to the face.
Concave mirror used in the ophthalmoscope: These mirrors are used in optical instruments as in Ophthalmoscope for treatment.
Uses of concave mirror in astronomical telescopes: These mirrors are also widely used in making astronomical telescopes. In an astronomical telescope, a converging mirror of a diameter of about 5 meters or more is used as the objective.
Concave mirrors used in the headlights of vehicles: Converging mirrors are widely used in headlights of automobiles and in the motor vehicles, torchlights, railway engines, etc. as reflectors. The point light source is kept at the focus of the mirror, so after reflection, the light rays travel over a huge distance as parallel light beams of high intensity.
Used in solar furnaces: Large converging mirrors are used to focus the sunlight to produce heat in the solar furnace. They are often used in solar ovens to gather a large amount of solar energy in the focus of the concave mirror for heating, cooking, melting metals, etc.
Image Formation By Concave Mirror And Their Ray Diagrams
When the object is kept at infinity:
As the parallel rays coming from the object converge at the principal focus, F of a concave mirror; after reflection through it. Therefore, when the object is at infinity the image will form at F.