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A converging lens of focal length is placed in contact with another converging lens of unknown focal length, then possible value for focal length of combination is
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Important Questions on Ray Optics and Optical Instruments
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In displacement method we use a lens of focal length and distance between object and screen is Possible value for focal length is
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A double convex lens has two surfaces of equal radii and refractive index its focal length is equal to
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The distance between a real object and its real image is formed by converging lens, focal length of lens is
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In displacement method, there are two position of a lens for which we get clear image. First position of the lens is at from object and second is at the focal length of lens is
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Maximum magnification produced by simple microscope of focal length is
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The magnifications produced by a convex lens for two different positions of an object are and respectively If ' is the distance of separation between the two positions of the object then the focal length of the lens is
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In case of displacement method of lenses, the product of magnification in both cases is
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In the displacement method, a convex lens is placed in between an object and a screen. If the magnifications in the two positions are and and the displacement of the lens between the two, positions is then the focal length of the lens is
