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6. Convex mirrors are used inside the buildings , They are also used in making lenses of sunglasses , They are used in magnifying glass , They are used in securities and they are used in telescopes .
7. The refractive index of a medium a with respect to vacuum is n=c/v (where c is the speed if light in vaciuum and v is the speed of light in medium a . Here, n=1.5 , c=3 * 10^8 . (n is the refractive index of medium glass with respect to vacuum.)
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