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?
Homework Answers
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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