The drawing below shows a balanced Michelson interferometer with perfectly equal length arms in which a piece of glass (n = 1.4) has been inserted into the horizontal arm. What is the minimum thickness of glass (t) which will produce a perfectly dark shadow in the middle of the bright background as shown in the picture if the light sauce is coherent, monochromatic, and has a wavelength of 500 nm? This is like the problem we worked in class