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In a container of height 21 ~cm , certain transparent liquid is taken to a height of 12 ~cm . When seen from above, it appears half filled. The refractive index of the liquid is

Options

  1. A7 6
  2. B5 4
  3. C3 2
  4. D4 3

Correct answer

D. 4 3

Step-by-step solution

Real depth of liquid = 12 cm Empty space above liquid = 21 - 12 = 9 cm Viewed from above, it appears half filled, meaning apparent depth of liquid = height of empty space = 9 cm = h_ real h_ app = 12 9 = 4 3

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