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CBSE Notes 2011-2012 » Forums » Open Discussion


1 reply [Last post]
madhavi19's picture
Joined: 10/06/2008

what is difference between focal point and focal plane?

bindhya's picture
Joined: 10/06/2008
focal point is the point on

focal point is the point on the principle axis to which a beam of parallel rays of light converges to after refraction through a convex lens or appears to come from after divergence from a concave lens. focal plane is that plane which contains the focal point but perpendicular to the surface of lens.