A point object is kept 10 cm away from one of the surfaces of a thick double convex lens of refractive index 1.5 and rodit of curvature 10 \mathrm{cm} and 8 \mathrm{cm} .
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Ray mapping method for off-axis and non-paraxial freeform illumination lens design
Ray mapping method for off-axis and non-paraxial freeform illumination lens design
Luminance spreading freeform lens arrays with accurate intensity control
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