refraction

For Home or Lab 1. Why is there no refraction at the second boundary of the semi-circular plastic container as the light re-emerges from the water to the air? 2. The index of refraction of diamond is 2.4. If the incident angle is 20, what is the angle of refraction? 3. Light from the setting sun comes through the earth's atmosphere along a curved path so that the sun looks higher in the sky than it really is. How do you explain this? Also, the setting sun appears to flatten somewhat. Because atmospheric refraction increases with objects near the horizon, the lower edge of the sun's disk is raised more than the upper edge. Illustrate this with a diagram. refraction al (n = 1 nino, = n, sing Diamond A - 2.4 2r