Answer:
4.57 degree
Explanation:
As the dolphin is under water, so the angle is angle of refraction which is equal to 48.4 degree.
refractive index of water, n = 1.333
Let the angle of incidence which is the angle between the incident ray and the normal is i.
By use of Snell's law



i = 85.43 degree
Angle made with the horizon = 90 - 85.43 = 4.57 degree
It would be, 1.000. Hope that helps :)
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