Primary and secondary focus?

What is difference between Primary and secondary focus of light?I also want to know the uses of these two focus.

2006-08-01 23:38:25 · 1 answers · asked by star123 2 in Science & Mathematics ➔ Physics

they're on diferent sides of the lens.

read the wikipedia article on lenses : there is no "use" of a focus, since it's only a property of the lens.

2006-08-01 23:58:34 · answer #1 · answered by Anonymous · 0⤊ 0⤋

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