What is a rarer medium and what is a denser medium?
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Due to this change in speed light bends and travels when passing from one medium to other medium. When the light ray passes from rarer mediumto denser medium it bends towards the normal. Example: Light ray passing from air to glass (Air � rarer medium, Glass - denser medium.
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A rarer medium is a medium with less refractive index and more rarer is opposite of it
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