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Byju's Answer
Standard X
Physics
Refractive Index
when a light ...
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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Draw a labelled ray diagram to show how a ray of light is refracted when it passes:
(a) from air into an optically denser medium.
(b) from an optically denser medium into air.