At which of the following distances from the lens should a slide be placed on...
PHYSICS
WAEC 1991
At which of the following distances from the lens should a slide be placed on a slide projector if f is the focal length of the projector length?
- A. less than f
- B. greater than f but less than 3f
- C. equal to f
- D. equal to 2f
Correct Answer: C. equal to f
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