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/principal-focal-point-(two-of-them)-convex-lens-35.5278959.jpg "Principal focal point (two of them)")
Principal focal point (two of them)
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Define principal focus of Convex lens and that of a concave lens.
Principal Focus of a Convex Lens
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Define main focus of convex lens.
Focus Systems
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Focus Systems
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Draw a diagram to represent the second focus of a convex lens.
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Focal Length of a Lens
/principal-focus-point-and-refractive-index-(n)-22-1_v2.c741a3f.jpg "Principal focal point and refractive index (`n`)")