Light travelling through the air (n = 1) is incident on a stack of four clear “optical” bricks (each 5 cm thick) at an incident angle of 15° from the surface normal. The first material has an index of 1.1, the second has an index of 1.3, the third has an index of 1.5. How much is the light displaced from where it was initially incident on the optical bricks at the top of the 4th brick?

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