- #1
alingy1
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A lens forms a real image of a lightbulb, but the image of the bulb on a viewing screen is blurry because the screen is slightly in front of the image plane. To focus the image, should you move the lens toward the bulb or away from the bulb.
Formulas:
1/s+1/s'=1/f
Well, in the book, the answer is move away. It says we need to decrease s', so increase s.
But I made drawings using ray-diagrams, and what I get is that, for an object further away from the focal point of a converging lens, moving the lens closer to the object would make more sense... The image plane actually gets closer to the object.
There seems to be a contradiction here...
Formulas:
1/s+1/s'=1/f
Well, in the book, the answer is move away. It says we need to decrease s', so increase s.
But I made drawings using ray-diagrams, and what I get is that, for an object further away from the focal point of a converging lens, moving the lens closer to the object would make more sense... The image plane actually gets closer to the object.
There seems to be a contradiction here...