Why does a spherical lens has two focii?

Asked by  | 5th Feb, 2012, 07:33: PM

Expert Answer:

A lens has two focal points - one on each side. They are equal distances from the lens. Since a lens consists of two surfaces, there are thus first and second focus and first and second focal plane

Answered by  | 6th Feb, 2012, 10:07: AM

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