Parallax method is useful

for measuring speed of the light.

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for measuring distances of star.

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for finding the intensity of the light.

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None of the above.

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Solution

The correct option is B for measuring distances of star.
$A n s w e r : -$ B
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines. Astronomers use the principle of parallax to measure distances to the closer stars.

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