# 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?Show work.

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

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