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mirror |
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mirror![]() Light rays reflected from a regular (plane) mirror. The angle of incidence is the angle between the ray and a perpendicular line drawn to the surface and the angle of reflection is the angle between the reflected ray and a perpendicular to the surface. The image of an object in a plane mirror is described as virtual or imaginary because it appears to be the position from which the rays are formed. Any polished surface that reflects light; often made from ‘silvered’ glass (in practice, a mercury-alloy coating of glass). A plane (flat) mirror produces a same-size, erect ‘virtual’ image located behind the mirror at the same distance from it as the object is in front of it. A spherical concave mirror produces a reduced, inverted real image in front or an enlarged, erect virtual image behind it (as in a shaving mirror), depending on how close the object is to the mirror. A spherical convex mirror produces a reduced, erect virtual image behind it (as in a car's rear-view mirror). FormulaIn a plane mirror the light rays appear to come from behind the mirror but do not actually do so. The inverted real image from a spherical concave mirror is an image in which the rays of light pass through it. The focal length f of a spherical mirror is half the radius of curvature; it is related to the image distance v and object distance u by the equation 1/v + 1/u = 1/f.
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| Tip: A dental mirror is useful when checking for damage or repairs inside a teapot or clock. DenLite DP5000 illuminated dental mirror (Welch Allyn) PantherJaw Technologies won the competition with an innovative dental mirror called ClearStrike , a self-cleaning, disposable dental mirror to combat the buildup of fog and debris, the idea for which came from |
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