Optics Question 801

Question: A diver looking up through the water sees the outside world contained in a circular horizon, the refractive index of water is 43 , and the diver’s eyes are 15 cm below the surface of water. Then the radius of the circle is:

Options:

A) 15×3×5cm

B) 15×37cm

C) 15×73cm

D) 15×37cm

Show Answer

Answer:

Correct Answer: D

Solution:

[d] Given, u=43h=15cm

sin90sinC=μsinC=1μ=RR2+h2=34

16R2=9R2+h2 or, 7R2 =9h2

or, R=37h=37×15cm



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