Path of a ray of light passing through three liquids of reflective indices `mu_(1), mu_(2), mu_(3)` is as shown in Fig. Which liquid has the smallest index of reflection ?
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As is clear from Fig., in going form liquid `A` to liquid `B`, the ray of light bends away from normal. Therefore, `mu_(2) lt mu_(1)`. Again, in going from liquid `B` to liquid `C`, the ray of light bends towards normal. Therefore, `mu_(2), mu-(3)`. Hence the smallest index of refraction is `mu_(2)`.
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