Problem: A man stands next to a 1.36 m tall barrel with a diameter of 0.58 m. If the barrel is empty, he can see 0.68 m down the far side of the barrel. This means light from this spot on the far side of the barrel is traveling straight to his eyes.
Part A: At what angle relative to the normal line is the light traveling to the man's eyes?
I want help to find at what angle relative to the normal line is the light traveling to the man's eyes.