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What is the essential angle for light moving from water (n1) to air (n2)?? (n1>n2)
White light bends less than any other colour when passing through a prism.

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For 589-nm light, calculate the critical angle for the following materials surrounded by air. (a) cubic zirconia (n = 2.20) (b) gallium phosphide (n = 3.50) (c) polystyrene (n = 1.49)
A1. As shown in Figure A1, a light ray is incident normal to one face of a 30°-60°-90° prism (n = 1.50) that is immersed in water (n = 1.33). Determine the exit angle 03. (a) Determine the exit angle 03. (b) Determine the critical angle for the prism-water system. n2 60.0° n1 Figure Al 021 30.0% D 103