Posted by **ali** on Friday, July 30, 2010 at 6:07pm.

A student has built a 20-cm-long pinhole camera for a science fair project. She wants to photograph the Washington Monument, which is 167 m (550 ft) tall, and to have the image on the film be 5.0 cm high.

- College physics -
**bobpursley**, Friday, July 30, 2010 at 6:17pm
Are not there two similar triangles here..from the pinhole enveloping the monument on one side, from the pinhole enveloping the image on the other.

Using similarity,

5cm/167m=.2m/d

solve for d, the distance to the Monument.

I think I did this problem in the 8th grade, it is odd seeing it again.

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