Ray Optics and Optical Instruments

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• When light enters from air to water, then its

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• A telescope has an objective lens of focal length 200 cm and an eye piece with focal length 2 cm. If this telescope is used to see a 50 meter tall building at a distance of 2 km, what is the height of the image of the building formed by the objective lens

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• A fist looking from within water sees the outside world through a circular horizon. If the fish $\sqrt{7}$cm below the surface of water, what will be the radius of the circular horizon

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• A tank is filled with benzene to a height of 120 mm. The apparent depth of a needle lying at a bottom of the tank is measured by a microscope to be 80 mm. The refractive index of benzene is

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• The Cauchy’s dispersion formula is

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