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JEE PHYSICS MCQ: UNITS & MEASUREMENTS

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Understanding +4 | -1

Assertion : Parallax method cannot be used for measuring
distances of stars more than 100 light years away.
Reason : Because parallax angle reduces so much that it
cannot be measured accurately.

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Correct option: A

Assertion is correct, reason is correct; reason is a correct explanation for assertion

Option A (Assertion is correct, reason is correct; reason is a correct explanation for assertion) is correct because the parallax angle becomes too small to measure accurately for stars beyond 100 light years.

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