31 Jul How can you determine the focal length of
How can you determine the focal length of a spherical mirror with accuracy? In today’s lab, we will be using three different methods to determine the focal length of a spherical/curved mirror.
1. Using one definition of the focal length, if an object is very far away (so that light rays are coming in parallel), where is the image of the object formed with respect to the focal length?
2. There is a light source far away from your mirror (down the hall or outside); how will you determine the focal length using this?
3. Using the mirror equation 1/f = 1/do + 1/di if the object and image distances are the same, where are they with respect to the focal length? do = di = ?f
4. How could you use this to determine the focal length?
5. The third way to determine the focal length is the most precise. Given the mirror equation, what two measurements do you need to make to determine the focal length? We will use a graphical method to get data from these measurements. Participate in the class discussion on this method.
When doing the graphical method, be sure to get a wide range of object distances, including some both smaller than and larger than the radius of curvature (C = 2f).
6. Go ahead and do the lab. Write your results for the three methods below.
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