Question

define principal focus

Answer 1

Answer:

geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge. Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle...

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Answer 2

1. Also called: principal focus, focus

the point on the axis of a lens or mirror to which parallel rays of light converge or from which they appear to diverge after refraction or reflection

2. a central point of attention or interest

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