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Q. What happens when light travels from a denser medium to a rarer medium?
Answer: it speeds up and bends away from the normal
Notes: A ray of light travelling from a rarer medium to a denser medium slows down and bends towards the normal. When it travels from a denser medium to a rarer medium, it speeds up and bends away from the normal.

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📌 Question Number: 17 in Physics GK 19 - Light and Human Eye in the above course in App.