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Question

A ray of light is incident at the glass-water interface at an angle i. It merges finally parallel to the surface of the water. Then, the value of μg would be(where μg is the refractive index of glass with respect to water)
42943_d6895f31ef2d42b5a6c4739a4cd4fa70.png
  1. (4/3)sini
  2. 1/sini
  3. 4/3
  4. 1

A
(4/3)sini
B
4/3
C
1/sini
D
1
Solution
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Using snell's law at water-glass surface, μgsini=43sinr
Using snell's law at water-air surface, 1×sin90=43sinr
μgsini=1

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