# P5.6.1.1 Measurement According To Foucault/Michelson

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# Determining the Velocity of Light by Means of the Rotating-Mirror Method According to Foucault and Michelson - Measuring the Image Shift as a Function of the Rotational Speed of the Mirror

Once the rotary mirror is turning at a high frequency ν, the shift Δx of the image on the scale is observed. In the period

which the light requires to travel to the rotary mirror and back to the end mirror, the rotary mirror turns by the angle

Thus, the image shift is

The velocity of light can then be calculated as

To determine the velocity of light, it is sufficient to measure the shift in the image at the maximum speed of the mirror, which is known (P5.6.1.2). Measuring the image shift as a function of the speed supplies more precise results (P5.6.1.1).

 1 476 40 Rotary mirror 1 471 830 He-Ne Laser, linearly polarised 1 463 20 Front-silvered mirror 1 460 12 Lens in frame, f=5 m 1 471 88 Beam splitter 1 460 22 Holder with spring clips 1 311 09 Glass scale, 5 cm 1 521 40 Variable transformer, 0...250 V 1 575 214 Oscilloscope 30 MHz, two-channel, analogous 1 559 921 Semiconductor detector 1 501 02 BNC cable, 1 m 1 501 10 BNC adapter, straight 1 300 41 Stand rod, 25 cm, 12 mm Ø 1 300 42 Stand rod, 47 cm, 12 mm diam. 1 300 44 Stand rod, 100 cm, 12 mm diam. 1 300 01 Stand base, V-shaped, large 4 300 02 Stand base, V-shaped, small 1 300 11 Saddle base 2 301 01 Leybold multiclamp 1 301 09 Bosshead S 1 311 02 Metal rule, 1 m

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