Light that is initially travelling in a layer of diamond is incident on a layer of sapphire as shown inFigure 5. The sapphire layer has thickness T = 3 cm. The angle inside the sapphire is 6, = 50°.When the light reaches a third layer, it experiences total internal reflection. The material of thethird layer is unknown. Figure 5 also shows a table with indices of refraction for various materials.Index ofDiamondMaterialRefractionIce1.31Fluorite1.43SapphireSapphire1.77?Diamond2.42Titanium2.90DioxideFigure 514. What is the incident angle 8, inside the diamond?a) 8, x 24°b) e, x 34°c) 8, x 44°d) e, x 54°e) 8, x 64°15. What is the horizontal distance x travelled inside the sapphire?a) x x 6.4 cmb) x x 7.2 cmc) x x 8.6 cmd) x x 9.3 cme) x x 12.1 cm16. Which of the following could be the material of the third layer?a) Ice onlyb) Fluorite onlyc) Either ice or fluorited) Titanium dioxide onlye) None of the above

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