what is the focal length of plane mirror?
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The focal length of a plane mirror is infinity; its optical power is zero.
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The minimum distance between an object and its real image in a convex lens is (f = focal length of the lens)
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Suppose an object is placed u cm in front of a spherical mirror of focal length f such that the image is formed v cm from the mirror, then u, v and f are related by the equation; 1/f= 1/u + 1/v. This equation is referred to as the mirror formula. The formula holds for both concave and convex mirrors.
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Answer: The focal length of a double convex length is 50 cm. Hence, the focal length of a double convex length is 50 cm.
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Study the following equation, called the "mirror equation," which relates the distance of an object (D object), the distance of the image (D image) and the focal length (F) of the mirror: 1/D object + 1/D image = I/F.
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The focal length of a concave mirror is 50cm. Where an object be placed so that its image is two times and inverted(a) 75 cm(b) 72 cm(c) 63 cm (d) 50 cm.
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Standard/Normal Lens The standard lens has a fixed focal length (50mm, 85mm, 100mm), and reproduces fairly accurately what the human eye sees – in terms of perspective and angle of view. For a 35mm film camera or a full-frame DSLR, the 50mm lens is considered standard.
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We say the “equivalent of” because, in real cameras, the focal length is a measure of where the light rays would converge to form an image on a frame of standard 35mm film or on the sensor of a full-frame DSLR. But because smartphones are much smaller, the actual focal length of the iPhone wide-angle lens is 4.25mm.
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Answer. Answer: The focal length of a double convex length is 50 cm. Hence, the focal length of a double convex length is 50 cm.
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For focal length, f in lens is always taken as negative for concave and positive for convex. In case of mirror the f is taken as negative if it is in -X side i.e., is in Concave mirror and taken as positive if it is in +X side i.e., is in Convex mirror.
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The focal length of a plano convex lens is 'f' and its refractive index is 1. 5. It is kept over a plane glass plate with its curved surface touching the glass plate. The gap between the lens and the glass plate is filled by a liquid.
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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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You can measure the radius of curvature (R) of the mirror by measuring the distance between convex mirror and the screen placed behind the mirror. You can calculate the focal length of the mirror using the equation f = R/2. You can verify you result by clicking on the 'Show result' button.
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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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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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In case of spherical mirrors (both concave and convex), there will be no change in the focal length of the mirrors when immersed in water. This is because the focal length of mirrors does not depend on the external medium in which it is held.
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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 positive, the image is on the same side of the mirror as the object, and it is real and inverted. When the image distance is negative, the image is behind the mirror, so the image is virtual and upright.