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New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.

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Was Martin Luther King, Jr., a Republican or a Democrat?

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paraxial image

optics

Learn about this topic in these articles:

optical ray-tracing

In optics: Paraxial, or first-order, imagery
In a lens that has spherical aberration, the various rays from an axial object point will in general intersect the lens axis at different points after emerging into the image space. By tracing several rays entering the lens at different heights…
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