A man shines a flashlight from a boat into the water, illuminating a rock as in the figure below. What is the angle of incidence θ1 (in degrees)?

A man shines a flashlight from a boat into the water, illuminating a rock as in the figure below. What is the angle of incidence θ1 (in degrees)?

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A man shines a flashlight from a boat into the water, illuminating a rock as in the figure below. What is the angle of incidence θ 1 (in degrees)?
HINT

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