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IMPORTANT
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A point object is placed at a distance of and its real image is formed at a distance of from a concave mirror. If the object is moved by towards the mirror, the image will shift by about
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Important Questions on Ray Optics
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If the focal length of a spherical mirror is , its radius of curvature will be:
HARD
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A diminished virtual image can be obtained only in
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The wavelength of light in two liquids 'x' and 'y’ is and , then the critical angle will be
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A microscope is focused on a mark, then a glass slab of refractive index and thickness of is placed on the mark to get the mark again in
Focus, the microscope should be moved
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Velocity of light in glass, whose refractive index w.r.t. air is is . In a certain liquid the velocity of light is found to be The refractive index of liquid w.r.t. air is:
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A point source of light is placed below the surface of the water of the refractive index . The minimum diameter of a disc, which should be placed over the source, on the surface of the water to the cut-off right coming out of water is
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When a ray of light enters a medium of refractive index , it is observed that the angle of refraction is half of the angle of incidence is than angle of incidence is
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White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains
