Discussion
Statement I: A ring laser gyro has no spin-up time.
Statement II: It senses rotation through the frequency difference between counter-rotating beams.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Both are true. A ring laser gyro has no rotor, so there is nothing to spin up and the instrument is available immediately.
It works by the Sagnac effect: two laser beams travel in opposite directions around a closed path, and rotation makes their effective path lengths differ, producing a frequency difference proportional to the rate. The absence of moving parts also removes bearing friction, so real drift is very much smaller than in a spinning mass gyro.
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