10. (10) You are using a red laser with wavelength 610 nm as light source for a
ID: 1350610 • Letter: 1
Question
10. (10) You are using a red laser with wavelength 610 nm as light source for a Michelson interferometer. You move one mirror very slowly and observe that there is a change from a bright to next bright fringe. Approximately, how far did the mirror move? 1.5 × 10-4 mm. 3.0 × 10-4 mm. 6.0 × 10-4 mm. 1.0 × 10-4 mm.10. (10) You are using a red laser with wavelength 610 nm as light source for a Michelson interferometer. You move one mirror very slowly and observe that there is a change from a bright to next bright fringe. Approximately, how far did the mirror move? 1.5 × 10-4 mm. 3.0 × 10-4 mm. 6.0 × 10-4 mm. 1.0 × 10-4 mm.
Explanation / Answer
The distance coverd by the mirror is,
d = N*wavelength /2 = 1 * 6.10*10-4 mm /2 = 3.0*10-4 mm (approximately)
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