The next two problems refer to the following situation 8 A M

The next two problems refer to the following situation 8. A Michelson interferometer splits a beam of light of unknown wavelength producing a bright fringe (i.e., all of the intensity) at the detector. As one mirror is moved a distance 2.1 microns from its original position, exactly 7 new fringes are observed to appear at the detector. What is the wavelength of the unknown light? a. 300 nm b. 400 nm c. 500 nm d. 600 nmm e. 700 nm 9. If the top mirror is replaced by one that leaks half of the light (ie., reflects only 50% of the intensity), which of the following describes the intensity at the detector (in terms of the initial beam intensity) as the right mirror is moved further to the right? a. Imax 8min , \'min=0 c. Imax=31/8. Imin-1/8 4min =-

Solution

Here is answer is (a).

When the light with wavelength 700 nm is incident upon diffraction grating ,the spacing between the lines increases,and the width doubles .