find the angle of refraction..
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According to Snell's law,
n1/n2 = sinα2/sinα1
1.3/1.5 = sinα2/sin60°
sinα2 = 1.3/√3
α2 = sin^(-1)[1.3/√3]
Where n1 and n2 are refractive index of water and air.
Alpha1 and Alpha2 are angle of incidence and refraction respectively.
Alpha2 = 48.6 degrees.(used calculator)
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do the last calculation
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option d is the correct answer
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