Young’s Experiment

Obviously, before and after the whole interferometer is turned by 90° in the experiment, and t t t      correspond to the same set of point, and according to the formula

2  )(cos2 1221 22 21 rrAAAA     

We know that the average light intensity of the interference stripe corresponding to and t t    is the same, which means that the brightness of the Interference Stripe is the same. Therefore, we get:

Conclusion two: In Michelson’s experiment and t t    corresponds to the same observational interference stripe.

3 The Difference between Michelson’s Experiment and Young’s Experiment

Based on the foregoing, in Young ’s experiment, the interference stripe and the difference )( 12 rr  is in one–one correspondence; but in Michelson’s experiment, before and after the whole instrument is turned by 90°, optical path difference c and c t t    , which is opposite number of each other, correspond to the same observational interference stripe. Therefore, the relationship between the interference stripe and the difference 2 1 ( ) r r  is not in one–one correspondence. So we get:

Conclusion three: Michelson’s experiment doesn’t have the necessary condition for the formula m 2 1 2 1 ( ) ( ) r r r r 

       is

tenable.

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