A laser ring gyroscope, or laser ring gyro (Figure 5), measures rotation using the constancy of the speed of light in any frame. Laser ring gyros have uses in navigation systems on aircraft and in detailed studies of Earth's rotation. Research this application of relativity, and summarize your findings in a brief report. Include a description of two applications of laser ring gyros and an analysis of the technology behind them.


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Ring laser gyroscopes use a phenomenon known as the Sagnac effect to accurately detect rotations of their frame of reference. They utilize a ring laser with oppositely propagating resonant modes along the same path. Any change in interference when the two beams are met will indicate the system's rotation.

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