!! 50 points spent, easy points for you. 8th-grade science/physics !!

1. A(n) ______ is an image of a distant object caused by light refraction through air of varying temperature.

2. A(n) ______ is a curved piece of glass or other transparent substance that is used to refract light.

3. A(n) ______ lens is thicker in the center than at the edges.

4. A(n) ______ lens is thinner in the center than at the edges.

5. The ______ is a measure of how much a ray of light bends when it passes from one medium into another.