Here are questions to ponder for this formal lab:
1. How are convex lenses and concave mirrors similar?
2. What would happen to a real image if a mirror or lens were half-covered? Does it matter HOW you cover it?
3. What is going on with convex mirrors and concave lenses?
4. Pick a data point from your convex lens trials. Use the measured do and di to calculate an experimental focal length (f), using the equation:
1/f = 1/do + 1/di
5. Repeat 4 for a data point from your concave mirror trials.
6. How close are your calculated focal lengths to your "theoretical" (taken outside) focal lengths? Calculate percent errors:
% Error = (experimental - theoretical) / theoretical x 100
7. What does the lens equation have to say about the following cases? If helpful, make up a focal length and plug it into the lens equation.
do is much, much greater than f
do = 2f
do = f
do < f
8. Do these answers (to 7) make sense in light of your data?
9. How can you tell mathematically if an image is virtual or real?
10. How could one determine the focal length of a convex mirror or concave lens?
11. So, what can you say about how images form (in a convex lens or concave mirror) as do progresses from greater than 2f to within f?
12. Don't forget to address sources of error in your report and write a general conclusion about the lab.
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