Astronomical instruments: What do large astronomical telescopes use as the objective? Consider modern observatory-class instruments designed for faint, distant objects. Choose the correct option.
IIT JEE
Physics
Difficulty: Easy
Choose an option
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AConvex lens (large refractor)
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BConcave lens
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CConcave mirror (reflector)
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DPlane mirror
Answer
Correct Answer: Concave mirror (reflector)
Explanation
ConceptReflecting telescopes use large concave mirrors: lighter for large apertures, no chromatic aberration, easier support from behind.
Final AnswerConcave mirror (reflector)