Question

determination of focal length​

Answer 1

Answer:

The principal focal length of a lens is determined by the index of refraction of the glass, the radii of curvature of the surfaces, and the medium in which the lens resides. It can be calculated from the lens-maker's formula for thin lenses. ... The rays then enter a diverging lens of focal length -10cm on the right.

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Answer 2

To find the focal length of a lens, measure the distances and plug the numbers into the focal length formula. Be sure all measurements use the same measurement system. The focal length is therefore 4 centimeters. The focal length of the lens is therefore 3.33 centimeters.

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