Worksheet 8.docx - Worksheet 8 1. If something “focuses”...

Worksheet 8
1. If something “focuses” diverging light rays from an object back into a single point, what does
that form?
2. What is the light sensitive screen of cells in the human eye? 3. A larger lens can “intersect” more light rays. What effect does this have on the brightness of the
image?
4. Which type of telescope uses lenses to collect and focus the light?
5. Which type of telescope uses mirrors to collect and focus the light?
6. Why is a secondary mirror needed? (Where would you have to put the “detector” and why
would it be a problem?)
7. In a telescope, this is the distance over which incoming parallel light rays are focused to a single
point.
8. This “power” is proportional to area, making it scale with the diameter of the primary “squared.”
9.