Define focal length.

Asked by  | 26th Jan, 2009, 02:44: PM

Expert Answer:

It is the distance of the point at which a parallel beam of light falling on a mirror or lens actually converges/diverges or appears to converge/diverge after passing through the lens/mirror , from the optical centre of the lens/mirror.

Answered by  | 26th Jan, 2009, 11:01: PM

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