In the given equation, if r is the radial distance, n is the refractiv – McqOptions

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1.	In the given equation, if r is the radial distance, n is the refractive index; what does z stands for?
A.	(d n/dr)
B.	Focal length
C.	Distance along the optical axis
D.	Axial angle
Answer» C. Distance along the optical axis

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