how to find the focal length of a mirror?
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Focal Length - The distance between the pole P of the concave mirror and the focus F is the focal length of the concave mirror. 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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Hence the focal length of a concave mirror is negative. In a convex mirror, the light rays from the object diverge after reflection. Light rays from infinity, parallel to the principal axis, thus move away from each other and do not meet at a point. ... Hence the focal length of a convex mirror is positive.
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Since the focal length of concave mirror is on the left side ,by sign convention it will be NEGATIVE. ... Going by the Cartesian convention of signs the focal length of concave mirror is negative since it lies to the left of the mirror where the pole is considered the origin and the principal axis be considered the X axis.
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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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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 of a concave mirror is 30cm, find the position of the object in front of the mirror so that the size of the image is three times the size of the object..
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Answer and Explanation: 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. This...
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The principal focal length of a lens is determined by the index of refraction of the glass, the radii of curvature of the surfaces, and the medium in which the lens resides. It can be calculated from the lens-maker's formula for thin lenses.
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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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Focal Length. 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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f, the focal length, is positive for a concave mirror, and negative for a convex mirror. ... When the image distance is negative, the image is behind the mirror, so the image is virtual and upright. A negative m means that the image is inverted. Positive means an upright image.
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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. (right) a concave mirror. Note that a lens has a focal point on both sides of the lens axis.
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The focal length of the lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters (e.g., 28 mm, 50 mm, or 100 mm). In the case of zoom lenses, both the minimum and maximum focal lengths are stated, for example 18–55 mm.
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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. ( ( 360/x ) - 1 ) . The number of images formed is equal to ( 360 / 90 ) - 1 = 4 – 1 = 3.
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Going by the Cartesian convention of signs the focal length of concave mirror is negative since it lies to the left of the mirror where the pole is considered the origin and the principal axis be considered the X axis.
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The focal length is f = 1/P = 3R/2; this is the distance of the focal planes out from the centre of the sphere, which is R/2 in front of and behind it. This can be checked directly.
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To find out how many images are formed when plane mirrors are tilted at an angle, use the formula N=360/a-1 , wherein N is the number of images formed and a is the given angle.