Using a Michelson interferometer and a light source of 400 nm,a change from bright to dark indicates a change in distance of A) 2.0 $\times$ 10^-4 mm. B) 4.0 $\times$ 10^-4 mm. C) 3.0 $\times$ 10^-4 mm. D) 1.0 $\times$ 10^-4 mm.

Question

Quizplus · Accepted Answer

A change from bright to dark in a Michelson interferometer corresponds to a path difference of half the wavelength. For a 400 nm light source, this is 200 nm, which is 2.0 * 10^-4 mm.

Using a Michelson Interferometer and a Light Source of 400 ×\times×

Using a Michelson Interferometer and a Light Source of 400 $\times$