# Point Source HELP

Point Source...HELP!!!

1. Homework Statement
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. Homework Equations

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

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CompuChip
Homework Helper
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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wow thank you very much!!