define secondary focus point with diagram
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The primary focal point (F1) of a lens is also called the Object-Space Focus. ... Secondary focal point (F2) of a lens is also called the Image-Space Focus. For a plus lens, this is the point where parallel rays from a distant point object are rejoined to form an image at that point.
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The primary focal point (F1) of a lens is also called the Object-Space Focus. ... Secondary focal point (F2) of a lens is also called the Image-Space Focus. For a plus lens, this is the point where parallel rays from a distant point object are rejoined to form an image at that point.
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