Question: A 35-mm slide (picture size is actually 24 by 36 mm) is to be projected on a screen 1.80m by 2.70m placed 7.50m from the

A 35-mm slide (picture size is actually 24 by 36 mm) is to be projected on a screen 1.80m by 2.70m placed 7.50m from the projector. What focal-length lens should be used if the image is to cover the screen?

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