Chapter 9: Ray Optics and Optical Instruments
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Optical instruments work on:
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Angular magnification of telescope is:
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Telescope is used for:
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Eyepiece acts as:
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Objective lens has:
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Magnifying power of microscope depends on:
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Microscope is used for:
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Magnifying power of telescope increases with:
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Astronomical telescope forms:
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Blue light deviates:
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Red light deviates:
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Dispersion is due to:
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Minimum deviation occurs when:
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Angle of deviation depends on:
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Prism causes:
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If f negative → lens is:
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Diverging lens is:
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Magnification = 1 implies:
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Image at infinity occurs when object at:
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If P = 2 D, f =
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Real image by convex lens is:
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Concave lens focal length is:
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Two lenses in contact → power is:
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Lens maker formula relates:
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Magnification (lens):
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Concave lens forms:
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Convex lens is:
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Unit of power:
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Power of lens =
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Lens formula:
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Refraction at normal incidence:
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Lateral shift occurs in:
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Apparent depth is:
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μ = 1 means medium is:
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Optical fiber works on:
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Total internal reflection occurs when:
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Critical angle exists when light travels from:
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Speed of light is minimum in:
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Refractive index depends on:
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Snell’s law states:
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Real image by mirror is:
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If radius of curvature = 20 cm, focal length =
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Convex mirror focal length is:
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For concave mirror, when object at infinity:
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Image formed by plane mirror is:
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Magnification in mirror is given by:
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Convex mirror always forms:
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Mirror formula is:
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A concave mirror produces a virtual image when object is placed:
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The focal length of a spherical mirror is half of its:
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