Struggling with this physics problem?

Anonymous
I am struggling with these physics problems and can't figure it out. Please help me understand.

1a. On a calm, bright day, you're scuba diving in a deep lake (n = 1.35), 6.20 m away from your sailboat in the horizontal direction. When you are 3.10 m below the surface, the top of the sailboat mast appears to you to be in a direction 33.0° from vertical. Calculate the height of the mast.

1b. From your point of view, the entire sky appears to be confined to a bright disk directly above you on the surface of the water. Determine the diameter of this circle.
Struggling with this physics problem?
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