Question

difference between focus and focal length

Answer 1

focus is a point and focal length is a length between optical centre to focus

Answer 2

what is the difference between the focus and focal length




Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle. ... Since light can pass through a lens ineither direction, a lens has two focal points – one on each side. The distance inair from the lens or mirror's principal plane to the focusis called the focal length.
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