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A slide projector needs to create a 98-cm-high image of a2.0-cm-tall slide. The screen is 350...

A slide projector needs to create a 98-cm-high image of a2.0-cm-tall slide. The screen is 350 cm from the slide.

Part A

What focal length does the lens need? Assume that it is a thin lens

Part B

How far should you place the lens from the slide?

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Answer #1

magnification = V/U = 98/2 = 49

V = 49*U

V + U = 350

Solving both equation

49U + U = 350

U = 7 cm (Ans of part B)

V = 49*7 = 343 cm

1/f = 1/V + 1/U

1/f = [1/49U + 1/U]

1/f = 50/49U

f = 49*7/50 = 6.86 cm

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