Homework Help: Physics

Posted by Emily on Saturday, May 22, 2010 at 4:29pm.

Subject: Light and Geometric Optics

Question: Where must a light source be placed in front of a concave mirror for
a) light energy to be concentrated to a single point
b)the light to be reflected in a parallel beam?

Physics - drwls, Saturday, May 22, 2010 at 8:28pm
a) Anywhere beyond the focal point will do. If you want the light concentrated at the same location as the source, the distance must be 2f.

b) At the focal point
Physics - Emily, Saturday, May 22, 2010 at 8:51pm
Thank you!

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