A beam of light incident on a plane mirror forms a real image on reflection. The incident beam is
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Focal length of a plane mirror is
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If an object is placed symmetrically between two plane mirrors, inclined at angle of 72 degree, then total no. of images formed
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The optical phenomena, twinkling of stars, is due to
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The unit of power of lens is
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Convex lens focus a real, point sized image at focus, the object is placed
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In optics an object which has higher refractive index is called
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Image formed by plane mirror is
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A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is
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Power of the lens is -40, its focal length is
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A concave mirror gives real, inverted and same size image if the object is placed
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Focal length of plane mirror is
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