what do you think you know about physics, physics is the study of matter under the effect of energy, but does this includes solid states bodies, atoms at ground states, object at microscopic size or object moving faster than light? these and more is what prompt me to ask again what is physics?
a plane
mirror as no focal point,focal point
are center of curvature of spherical mirrors or lens. plane mirrors are flat
and has zero curvature and therefore has no focal point.
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