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how do you find the focal length. The convex lens is thicker in the middle and thinner at the edges and is also known as the converging lens. Finding focal length uses the focal length formula and requires knowing the distance from the original object to the lens u and the distance from the lens to the image v.
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Click to see full answer. This is the standard textbook definition but its still not entirely obvious WHY you need to know about it before your purchase a new lens. Be sure all measurements use the same measurement system.
It is often misunderstood that the focal length is measured from the front or rear of the lens.
In the sign convention used in optical design a concave mirror has negative radius of curvature so. In the sign convention used in optical design a concave mirror has negative radius of curvature so. Here F is the focal point and f is the focal length. 1AFOV 2tan1 h 2f AFOV 2 tan 1.
