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A focal arrangement that has a secondary mirror that reflects the focused light back through a hole in the primary mirror is a _______________. a. Cassegrain focus b. Newtonian focus c. Schmidt-Cassegrain
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A focal arrangement that has a secondary mirror that reflects the focused light back through a hole in the primary mirror is a _______________.

a. Cassegrain focus
b. Newtonian focus
c. Schmidt-Cassegrain focus
d. Schmidt focus

User Widor
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a. Cassegrain focus is the focal arrangement in a Cassegrain reflector used in optical telescopes and radio antennas. The primary mirror is a concave mirror, and the secondary mirror that reflects the focused light back to it is a convex mirror.
User Tbischel
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