Assertion : Parallax method is used for measuring distances of nearby stars only.
Reason : With increase of distance of star, parallactic angle becomes too small to be measure accurately.

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If both assertion and reason and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false.

answer is A.

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Detailed Solution

As the distance of star increases, the parallax angle decreases, and great degree of accuracy is required for its measurement. Keeping in view the practical limitation in measuring the parallax angle, the maximum distance of a star we can measure by parallax method is limited to $100$ light year.

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