Refraction-help please? even if you dont know all of them, any help is good! Thanks!?

Exercise 9: Alison sees a coin at the bottom of her swimming pool at an angle of 40.0° to the normal and she dives in to retrieve it. However, Alison doesn’t like to open her eyes in the water so she must rely on her initial observation of the coin made in the air. At what angle does the light from the coin travel as it moves toward the surface? (nwater = 1.33)

Exercise 10: Here’s an interesting trick to try. Place a penny in the bottom of a cup and stand so that the penny is just out of sight, as shown. Then pour water into the cup. Without moving, you will suddenly see the penny magically appear. If you look into the cup at an angle of 70.0° to the normal, at what angle to the normal must the penny be located in order for it to just appear in the bottom of the cup when the cup is filled with water? (nwater = 1.33)

Exercise 11: Rohit makes his girlfriend a romantic candlelight dinner and tops it off with a dessert of gelatin filled with blueberries. If a blueberry that appears at an angle of 44.0° to the normal in air is really located at 30.0° to the normal in the gelatin, what is the index of refraction of the gelatin?