Point Source HELP

1. Mar 30, 2008

BuBbLeS01

Point Source...HELP!!!

1. The problem statement, all variables and given/known data
A point source of light illuminates an aperture 2.3 m away. A 10.2-cm-wide bright patch of light appears on a screen 1.02 m behind the aperture. How wide is the aperture?

2. Relevant equations

3. The attempt at a solution
This looks like a geometry problem but I am not seeing it??

2. Mar 31, 2008

CompuChip

I have included a drawing of the situation in the attachment.
You can use the blue triangle to find the angle $\alpha$.
Then use standard trigonometry to find the answer (which is the length of one of the sides of the red triangle).

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• aperture.jpg
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3. Mar 31, 2008

BuBbLeS01

wow thank you very much!!