the focal length of a mirror is given by?
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The focal length of a mirror is given by f2​=v1​−u1​.
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Focal length (shown in red) is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror — the point where parallel rays of light meet, or converge.
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The focal length of each lens can be calculated using a simplified thick lens equation. f= R/(n-1), where n is the index of refraction and R is the radius of curvature of the lens surface. These lenses are fabricated from N-BK7, which has an Abbe Number of 64.17; this value is an indicator of the dispersion.
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The focal length of a plane mirror is infinite. When parallel rays fall on a mirror surface, they are brought to a point after reflection.
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By convention, distances are measured, along the central axis, as positive from the mirror in the direction of the object and negative away from the object. Hence the radius of curvature and the focal length are positive for concave mirrors and negative for convex mirrors.
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A dioptre (British spelling) or diopter (American spelling) is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres. (1 dioptre = 1 m−1.) It is thus a unit of reciprocal length.
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In a concave mirror, the light rays from the object converge after reflection. ... Hence the focal length of a concave mirror is negative. In a convex mirror, the light rays from the object diverge after reflection.
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The focal length ( f ) is the distance from a lens or mirror to the focal point ( F ). This is the distance from a lens or mirror at which parallel light rays will meet. Light rays that are parallel to each other, but not to the optical axis, will meet on the focal plane. ...
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A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light. A system with a shorter focal length bends the rays more sharply, bringing them to a focus in a shorter distance or diverging them more quickly.
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The focal length of a lens determines the magnification at which it images distant objects. It is equal to the distance between the image plane and a pinhole that images distant objects the same size as the lens in question.
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Finally, the distance from the mirror to the focal point is known as the focal length (represented by f). Since the focal point is the midpoint of the line segment adjoining the vertex and the center of curvature, the focal length would be one-half the radius of curvature.
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Focal length of a plane mirror is infinity. (A plane mirror can be considered as a spherical mirror of infinite radius of curvature. Focal length is half of radius of curvature and hence it is infinity.
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The number of images formed by two adjacent plane mirrors depends on the angle between the mirror. If (in degrees) is angle between the plane mirrors then number of images are given by, n = 360 θ − 1. We verify this formula in this experiment.
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To determine the focal length of a concave mirror, by obtaining image of a distant object. A concave mirror, like a plane mirror, obeys the laws of reflection of light. ... Thus, the focal length of a concave mirror can be estimated by obtaining a 'Real image' of a distant object at its focus, as shown in the figure.
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Spherical mirrors have various refractive indexes based on the wavelength of the light. In other words, the refractive index becomes lesser as the wavelength of light becomes more. ... Therefore, the focal length of a spherical mirror is increased when the wavelength of the light used is increased.
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The focal length of a spherical mirror is not affected when it is immersed in water - it remains same. Laws of reflection are independent of medium and hence reflection takes place in any medium without the change of focal length. But, in case of LENS, the focal length changes.
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A cardboard screen is put behind the lens. We change the distance of the screen from the convex lens until a clear inverted image of the window is formed on the screen. Measure the distance of the screen from the lens with a scale. This distance will be the focal length of convex lens.