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Question:
Portray is a principal ray for the case of a concave lens. Where does it depart from here?
Ans:
In the situation of a diverging lens there is a ray that approaches the plane of the lens along a line that is parallel to the principal axis of the lens. On the plane of the lens that ray jumps onto a path which if traced back through the lens can be seen to be on a line that passes through the focal point on the same side of the lens as the object.
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