Physics Electromagnetic Waves Reflection and Refraction

A diver at a depth of 10 m inside water sees the sky in a cone of semi-vertical angle θ. If the refractive index of water is 1.34, the value of θ is

1
sin-1(0.75)
2
sin-1(0.55)
3
sin-1(0.33)
4
sin-1(0.62)
5
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