A fish looking up through the water sees the outside world contained in a circular…
Physics · JEE Main · NTA Exams — Optics
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 fish is \(12 \mathrm{~cm}\) below the surface, the radius of the circle in \(\mathrm{cm}\) is
- \(12 \times 3 \times \sqrt{5}\)
- \(4 \times \sqrt{5}\)
- \(12 \times 3 \times \sqrt{7}\)
- \(12 \times 3 / \sqrt{7}\)
Answer
(D) 12 3 / 7
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