math
how do i find the diameter of a circle c=44
physics
1. what happens to a narrow light beam that enters parallel to the principal axis on a spherical concave mirror? 2. what happens to a narrow light beam that passes through the focal point of a concave mirror before being reflected?
Physics
in many cars the passanger-side-rear-view mirror has a warning that reads "objects may be closer than they appear" is the mirror concave or convex? Explain
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