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May 23rd, 2010, 06:28 PM   #1
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Mirror and Detector

Hey guys! My daughter and her class needs help figuring out how to do this problem. Please reply if you do know how to solve it. My daughter is currently in trigonometry/precalculus so please try to keep it at that level. Thanks!

The curator of the Metropolitan Museum has hired you to design and install an intrusion alarm system to protect the priceless Great Green Emerald and its companion, the Royal Red Ruby. These beautiful stones are on display in a circular display case 10 diameter, centered in the 30-foot-square gallery. The source of the light beam is S, just to the right of the room's only door. The bean grazes the display case twice, striking the mirror at M and a detector at D.

1. Locate the mirror and the detector, and determine angle a
2. Locate the mirror and the detector if the source is moved to the left side of the door. Why would this be an unwise thing to do?

sorry but mymathforum won't let me attach the file with the diagram.
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May 24th, 2010, 05:33 AM   #2
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Are you able to put a really clear diagram on a site that provides free image hosting and provide a link to it?
I notice you've posted this problem elsewhere, but the image there is too hard to see.
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May 24th, 2010, 02:49 PM   #3
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Re:

Quote:
Originally Posted by skipjack
Are you able to put a really clear diagram on a site that provides free image hosting and provide a link to it?
I notice you've posted this problem elsewhere, but the image there is too hard to see.
thanks for trying to help. on the other forum, one of the users replied to my post with a graph. i believe that would help. below is the link.
http://www.mathhelpforum.com/math-help/ ... ector.html
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