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Question

when a light ray passes from air to denser medium its speed is reduced by 30+. What is thr refractive index of the medium.

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Solution

Dear student

refractive index is the ratio of speed of light in air to that in medium

refractive index (the speed reduces by 30 %)

= c/(c-0.3c)=c/0.7c
=1.4
c is speed of light

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