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Lenses applied in achromatic combination having dispersive power in a ratio of if focal length of concave lens is , then focal length of another lens will be:
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Important Questions on Ray Optics
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If the magnitude of dispersive powers of two lenses are and . Then their focal lengths will be for aberration-free combination.
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An achromatic convergent doublet of two lenses in contact has a power of . The convex lens has power . What is the ratio of the dispersive powers of the convergent and divergent lenses?
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The dispersive powers of the materials of the two lenses are in the ratio . If the achromatic combination of these two lenses in contact is a convex lens of focal length , then the focal lengths of the component lenses are
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Two lenses of focal length and when put in contact behave like a convex lens. They will have zero longitudinal chromatic aberration if their dispersive powers are in the ratio
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Refractive index of violet, yellow and red colour of height for a material of lens are , and , respectively. If the mean focal length of the lens is . Then chromatic aberration between the colour of violet and red will be
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The focal length of a convex lens is . Its magnifying power for a minimum distance of distinct vision will be
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An astronomical telescope of magnifying power is made using two lenses spaced apart. The focal length of the lenses used are
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The magnifying power of the objective of a compound microscope is If the magnifying power of microscope is the magnifying power of eye lens will be:
