In most applications of concave spherical mirrors (including this activity) it is assumed that all light rays travelling parallel to the mirror's optical axis are reflected through the mirror's focal point; however, this is an approximation that applies only to light rays traveling near the mirror's optical axis. In a few sentences, explain why a concave spherical mirror does not reflect all light rays travelling parallel to its optical axis through its focal point.
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In most applications of concave spherical mirrors (including this activity) it is assumed that all l...
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