alleryThe Cassegrain telescope design uses the reflective property of a:
AParabola (rays through focus to source)
BHyperbola (ray to one focus reflects to other)
CEllipse (light from one focus reflects to other)
DCircle (perpendicular reflection)
Answer & Solution
Correct answer: B. Hyperbola (ray to one focus reflects to other)
Cassegrain telescope uses a parabolic primary mirror + HYPERBOLIC secondary mirror.
**The hyperbola's reflective property:** ray aimed at one focus reflects to the other focus, which is useful for the eyepiece location.
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