A lens has 2 focal points or foci as shown in the drawings below...
A. A convex-convex lens is a converging lens. P rays that enter the lens from the left side will converge at and pass through the focal point on the right or far side. The focal point on the left or near side is not used. Sketch three P rays passing through the converging lens provided. Note: Instead of refracting the ray at each interface, assume the ray refracts only once, at the dashed central bisector of the lens
B. A concave-concave lens is a diverging lens. P rays entering from the left will diverge away from the focal point on the left. The right side focal point is not used. Sketch 3 P rays passing through the diverging lens provided.
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