Optics Appendix Problem 6

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A source of parallel rays is shown (position is given in meters and angle is given in degrees).  You can change both the position and the direction of the source and both the position and angle of the protractor by click-dragging.  Restart.

1. What optical element is hidden behind the curtain?
2. What is the focal length of the hidden element?  Assume the curtain is centered on the optical element. 

Problem authored by Melissa Dancy.
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