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Subject	Replies	Date
How the focal length of a lense is related to wave length?	0	1/8/2014
What is the relation between focal length and refractive index?	0	12/5/2013
What is the mathematical relation for focal length?	0	7/2/2013
Focal length of a biconvex lens is equal to the radius of curvature of either face. What is the refractive index of lens material	0	12/6/2012