What is the difference between focus and principal focus
Question asked by: vinay
Asked on: 28 Sep 2008
Here is the definition of principal focus:
That point where the light rays coming from a distant object converge after passing through a lens, coming to a focus and forming an image
Therefore principal focus is a specific term with a specific definition; focus is just a generic term for accurately rendering light rays.
By: knowitall
Replied at: 05 Oct 2008
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focus principal difference
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Q1.
(a) A Rabbit Runs Across A Parking Lounge With Coordinates (metres) As A Function Of Time As: X= -0.3t2+7t+28 And Y=0.2t2 -9t+30. Find The Rabbit’s Position Vector In Unit Vector Notation And In Magnitude Angle Notation At Time T=15s.
(b) A Bob Ti