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Question

A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12cm below the surface, the radius of this circle (in cm) is:
  1. 365
  2. 367
  3. 367
  4. 45

A
367
B
367
C
365
D
45
Solution
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sinic=1μ=rr2+h2
Using h=12 cm, μ=4/3
We get r=367 cm.
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