/principal-focus-point-and-refractive-index-(n)-22-1_v2.c741a3f.jpg "Principal focal point and refractive index (`n`)")
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/principal-focal-point-(two-of-them)-convex-lens-36.77d7742.jpg "Principal focal point (two of them)")
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/principal-focal-point-(two-of-them)-convex-lens-35.5278959.jpg "Principal focal point (two of them)")
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