Question

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

Answer 1

The number of fringe pattern shift is m = 40

Step-by-step 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 = (m * \lambda)/(2)`

Here
`m` is the number of fringe pattern shift

So

`20 \lambda = (m * \lambda)/(2)`

`40 \lambda = m * \lambda`

m = 40