Class 10 Light Reflection and Refraction Quiz Set 3


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


2. To determine the focal length of a concave mirror by forming image of a distant object, the screen should be placed


3. 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. 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. 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?



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