Example: barber
ENGINEERING OPTICS WITH MAT LAB*
principle, out the many paths that connect the two end points A and B, the light ray would follow that path for which the OPL between the two points is an extremum, i.e., 8{OPL) = 6 I n(x,y,z)ds = 0 (1.1-2) Jc in which S represents a small variation. In other words, a ray of light will
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