- #1
map7s
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A camera with a focal length f of 6 cm is used to take the picture of a person who is 180 cm tall, standing at a distance 3 m in front of the camera.
How big will the image of that person be on film?
How far behind the lens (assumed to be very thin) must the film be placed?
I tried using the thin-lens equation and the equation of magnification, but I can't seem to be getting the right answer.
(1/d o)+(1/d i)=(1/f)
m=-(d i)/(d o)
Using the first equation, I plugged in the numbers for f and d o and solved for d i. I know that there is something special with the signs, but I tried them every way possible, and I still can't get the right answer.
How big will the image of that person be on film?
How far behind the lens (assumed to be very thin) must the film be placed?
I tried using the thin-lens equation and the equation of magnification, but I can't seem to be getting the right answer.
(1/d o)+(1/d i)=(1/f)
m=-(d i)/(d o)
Using the first equation, I plugged in the numbers for f and d o and solved for d i. I know that there is something special with the signs, but I tried them every way possible, and I still can't get the right answer.