Focal length of lens is the distance from the center of the lens to its focus, usually denoted in F. Its unit is usually expressed in millimeter. The larger the distance, the farther the clear image can be taken.
What is lens focal length?
Focal length of lens is the distance from the center of the lens to its focus, usually denoted in F. Its unit is usually expressed in millimeter. The larger the distance, the farther the clear image can be taken.
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