Class 10 Light Reflection and Refraction Quiz Set 3 1. A point object is placed at the centre of a glass sphere of radius 6 cm and refractive index 1.5. The distance of the virtual image from the surface of the sphere is 4 cm 6 cm 2 cm 12 cm 2. A concave lens of focal length f forms an image which is n times the size of object. The distance of object from the lens is [(1+n)/n]f [(1-n)/n]f (1+n)f (1-n)f 3. To determine the focal length of a concave mirror by forming image of a distant object, the screen should be placed parallel to the plane of mirror in any direction at right angle to the plane of mirror inclined at angle of 45° 4. Two thin lenses of power 3 D and -2 D are placed in contact, then power and focal length of the combination of the lenses is +5 D, +20 cm +1 D, +100 cm +2 D, +100 cm +1 D, -100 cm 5. The velocity of light in glass is 2 x 10⁸ m/s and that in air is 3 x 10⁸ m/s. By how much would an ink dot appear to be raised, when covered by a glass plate 6.0 cm thick? 6.0 cm 1.5 cm 2.0 cm 4.0 cm Loading …
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