JEE Main 2014PhysicsRay OpticsMediumMCQ

JEE Main 2014 — Ray Optics Question with Solution

JEE Main 2014 (09 Apr Online)

Question

A diver looking up through the water sees the outside world contained in a circular horizon. The refractive index of water is 4 3 , and the diver's eyes are 15 cm below the surface of the water. Then the radius of the circle is :

Choose an option

Show full solutionCorrect option: B
Correct answer
B15×37 cm

Step-by-step explanation


∴    sin  θ c = 1 μ

                = 3 4

∴    r h 2 + r 2 = 3 4

∴    r 2 h 2 + r 2 = 9 1 6

∴    1 6 r 2 = 9 h 2 + 9 r 2

          7 r 2 = 9 h 2

             r = h 9 7

               = 3 h 7

               = 3 7 × 1 5  cm

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About this question

This is a previous-year question from JEE Main 2014, covering the Ray Optics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.