A block is constructed from layers of cubic zirconia (n = 2.14), flint glass (n = 1.89), and quartz (n = 1.54) as shown in the figure below. The block is surrounded by air. A ray of monochromatic light is incident on the cubic zirconia–flint glass interface with θi = 27.0°. What is the refraction angle θt when the ray exits the

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your link didn't work for me. What you will have to do is figure the layers separtely: the input angle and refraction angle, and that refraction angle beomes the next input angle....