(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 35mm slide(picture size is actually 24 by 36 mm)is to be projected on a screen1.80m by 2.70 m placed 7.50m from the projector. What focal length lens should be used if the image is to cover the screen?

2. Relevant equations

the only equation i can think of is the lens equation which is (1/Do)+(1/Di)=1/f

3. The attempt at a solution

I have tried starting this problem numerous times and just have no clue how to start it

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# Light: Geometric Optics

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