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Question

A certain LCD projector contains a single
thin lens. An object 18.2 mm high is to
be projected so that its upright image fills
a screen 2.04 m high. The object-to-screen
distance is 1.44 m.
Find the focal length of the projection lens.
Answer in units of mm.
How far from the object should the lens of
the projector be placed in order to form the
image on the screen?
Answer in units of mm.

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