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Compute each part of following problem given below:

Problem: The projection lens in a certain slide projector is a single thin lens. A slide 24.7 mm high is to be projected so that its image fills a screen 1.82 m high. The slide-to-screen distance is 3.10 m.

Part A: Determine the focal length of the projection lens.

Part B: How far from the slide should the lens of the projector be placed to form the image on the screen?

Please show clearly with details so that I can follow. Thanks.

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