Answer: Solid only
Answer: it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .
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Answer: Periscope
Answer: Telemeter
Answer: Spherometer
Answer: metals are good conductor of heat
Answer: Moment of force
Answer: necessary centripetal force may be obtained from the horizontal component of the weight of the train
Answer: they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable
Answer: at a place in a valley below sea level
Answer: the level of the liquid in the two vessels are at the same height
Answer: These rays make materials cool on which they fall.
Answer: collision between fast neutrons and nitrogen nuclei present in the atmosphere
Answer: 14 m/s
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