Solving Point Source Light Problem | HELP

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SUMMARY

The discussion centers on solving a geometry problem involving a point source of light illuminating an aperture. The scenario describes a light patch measuring 10.2 cm on a screen located 1.02 m behind the aperture, which is 2.3 m away from the light source. Participants suggest using trigonometric principles to determine the width of the aperture by calculating the angle α and applying standard trigonometric relationships to find the necessary dimensions.

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Point Source...HELP!

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?


Homework Equations





The Attempt at a Solution


This looks like a geometry problem but I am not seeing it??
 
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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).
 

Attachments

  • aperture.jpg
    aperture.jpg
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wow thank you very much!
 

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