What is the focal length of a lens

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Answer 1

Answer:

The focal length of a lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters.

this is refering to a camera lens, not glasses and what not, glasses do not have a focus length, only equipment that has the ability to focus

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Related Questions

high school and collage students answers only.
Are all compounds molecules? Why or why not?

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All compounds are molecules but not all molecules are compounds. A molecule is two atoms joined together. A compound is two different atoms joined together.
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