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| Summary |
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| Light is a form of energy which can be reflected either by a plane or spherical mirror. Depending upon the type of mirror used for reflection of light the use of reflecting surface also varies. In the next chapter let us see what happens when light moves from one medium to another. |
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| Light |
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| Light is an external cause responsible for sensation of vision. |
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| Reflection |
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| Reflection is the phenomenon where the incident light falling on a surface is sent back to the same medium. |
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| Laws of Reflection |
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| The incident ray, the reflected ray and the normal at the point of incidence lie in the same plane. |
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The angle of incidence is equal to the angle of reflection. |
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gives the number of images formed when the mirrors are inclined at an angle. |
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| Concave Mirror |
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| Concave mirror is a spherical mirror whose reflecting surface is towards the
center of the sphere of which the mirror is a part. |
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| Convex Mirror |
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| Convex mirror is a spherical mirror whose reflecting surface is away from the
center of the sphere of which the mirror is a part. |
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| Center of Curvature (C) |
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| Center of curvature (C) is the center of the sphere of which the spherical mirror forms a part. |
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| Radius of Curvature (R) |
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| Radius of curvature (R) is the radius of the sphere of which the mirror is a part. |
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| Linear Aperture |
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| Linear aperture is the distance between
the extreme points on the periphery of the mirror. |
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| Pole |
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| Pole is the mid point of the aperture of the spherical mirror. |
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| Principal Axis |
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| Principal axis is the straight line passing through the pole and the
center of curvature of a spherical mirror. |
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| Principal Focus |
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| The rays of light parallel to the principal axis of a mirror after reflection, either pass through a point (in the case of a concave mirror) or appear to diverge from a point (in the case of a convex mirror) on the principal axis and this point is referred to as the principal focus of the mirror. |
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| Focal Length |
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| Focal length is the distance between the pole and the focus of a mirror. |
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| Focal length of a mirror is equal to half the focal length
of the mirror or f = R/2. |
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| Mirror Formula |
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| Magnification |
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| Magnification is the ratio of the height of the image to the height of the object. |
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