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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 _______________.

ACassegrain focus
BNewtonian focus
CSchmidt-Cassegrain focus
DSchmidt focus

Verified Answer :

MonikaMole1421


ACassegrain 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.

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