your, Freind mayank parents has to go out of town to his grandparents house for the week as his grandfather is very unwell but mayank cannot miss his half yearly exams nor can he stay all by himself write a letter to mayank inviting him to stay with you as long as he wishes your grandparents are their and you have servants so it will not cause any inconvenience to you write a letter
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the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.
change in direction of propagation of any wave as a result of its travelling at different speeds at different points along the wave front.
measurement of the focusing characteristics of an eye or eyes.
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