the converging or diverging power of a lens depends upon the difference of refractive index of lens with respect to the medium in which it is placed. if a converging lens having power p is immersed in a liquid, its focal length
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People have to face many difficulties at the place where a dam is being built, such as: (i) Their houses, farms etc. Are all destroyed. (ii) They are promised to be given some compensation by the government but sometimes, they have to face many difficulties in getting this compensation.
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