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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