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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

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

VP5.6.1.1

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Description

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 in experiment P5.6.1.1, the image shift is measured as a function of the speed of the mirror.

Components of equipment sets

1	47640 4	Rotary mirror
1	471832	He-Ne laser, unpolarised
1	46320	Front-silvered mirror
1	46012	Lens in frame, f=5 m
1	47188 8	Beam splitter
1	46022 4	Holder with spring clips
1	311091 4	Glass scale 50 mm
1	52140 8	Variable transformer, 0...250 V
1	575302	Oscilloscope 30 MHz, digital, PT1265
1	559921 8	Semiconductor detector
1	50102 8	BNC cable, 1 m
1	50110 4	BNC adapter, straight
1	30041 4	Stand rod, 25 cm, 12 mm Ø
1	30042 4	Stand rod, 47 cm, 12 mm diam.
1	30044 4	Stand rod, 100 cm, 12 mm diam.
1	30001 4	Stand base, V-shaped, large
4	30002 4	Stand base, V-shaped, small
1	30011 4	Saddle base
2	30101 4	Leybold multiclamp
1	30109 4	Bosshead S
1	31102 4	Metal rule, 1 m

Experiment Instructions

PDF (Experiment description)

P5.6.1.1 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

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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

Description

Components of equipment sets

Experiment Instructions

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