At night an underwater scuba diver aims a flashlight beam toward the surface at 15° to the normal. Upon emerging into the air, the beam angle will be

Question

Quizplus · Accepted Answer

When an underwater scuba diver aims a flashlight beam toward the surface at an angle, the angle of incidence is greater than the angle of refraction. This means that when the beam emerges into the air, it will be refracted away from the normal. Since the angle of incidence is 15°, the angle of refraction will be less than 15°. Therefore, the beam angle when it emerges into the air will be more than 15°.

At Night an Underwater Scuba Diver Aims a Flashlight Beam