Question

When the adjustable mirror on the Michelson interferometer is moved 20 wavelengths, how many fringe pattern shifts would be counted

Answer 1

Answer:

The number of  fringe pattern shift is   m  = 40

Explanation:

 From the question we are told that

      The  Michelson interferometer is moved 20 wavelengths i.e  $20 \lambda$

Generally the distance which the  Michelson interferometer is moved is mathematically represented as

         $d = \frac{m * \lambda}{2}$

Here $m$ is the number of  fringe pattern shift

     So

         $20 \lambda = \frac{m * \lambda}{2}$

         $40 \lambda = m * \lambda$

        m  = 40