when a light ray passes from a rarer medium to a denser medium it bends towards the normal
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a light ray passes from a rarer medium to a denser medium it bends towards the normal it shows total internal reflection and there formed critical angle
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Refraction is the bending of light rays after entering a medium where its speed is different. Due to refraction of light, when a ray of light passes from a rarer medium to a denser medium, bends towards the normal to the boundary between the two media. The amount of bending depends on the indices of refraction of the two media. Hence, when a ray of light from air enters a denser medium, it bends towards the normal.
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