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A slide projector needs to create a 98-cm-high image of a 2.0-cm-tall slide. The screen is 300 from the slide. Assume that the projector has a thin

A slide projector needs to create a 98-cm-high image of a 2.0-cm-tall slide. The screen is 300 from the slide. Assume that the projector has a thin lens.

What focal length does the lens need?

How far should you place the lens from the slide?

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Physics-8226501.doc

Solution:GivenHo=98
Hi=2
Distance i.e u+v=300cm
Magnification, m = ho/hi = 98/2 = 49
Also,
v/u (=m) = 49 .. .. v = 49u ---- 1
v + u = 300cm .. .. u = (300 - v) ---- substitute into 1
v = 49(300 -...

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