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Hold the lens up to the window and hold a piece of paper behind it (on the other side of the lens
from the window). Move the paper until you get a sharp image of the world outside the windows (or
distant object such as a tree). When you have a sharp image, you measure the distance between the lens
and the image (paper). This distance is the focal length of the lens.
from the window). Move the paper until you get a sharp image of the world outside the windows (or
distant object such as a tree). When you have a sharp image, you measure the distance between the lens
and the image (paper). This distance is the focal length of the lens.
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