physics

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A certain LCD projector contains a single thin lens. An object 23.5 mm high is to be projected so that its image fills a screen 1.87 m high. The object-to-screen distance is 3.05 m.
(a) Determine the focal length of the projection lens.
mm
(b) How far from the object should the lens of the projector be placed in order to form the image on the screen?
mm

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