Question: A Michelson interferometer is set up using white light. The arms are adjusted so that a bright white spot appears on the screen (constructive interference

A Michelson interferometer is set up using white light. The arms are adjusted so that a bright white spot appears on the screen (constructive interference for all wavelengths). A slab of glass (n = 1.46) is inserted into one of the arms. To return to the white spot, the mirror in the other arm is moved 6.73 cm.
(a) Is the mirror moved in or out? Explain.
(b) What is the thickness of the slab of glass?

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