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5. What is the name of the medium that light travels in if the critical angle is 44.0 when it goes towards a boundary with air ( 3 marks) 6. What is the critical angle if light travels from opal to acetone? (2 marks) 7. What is the critical angle for light when it goes from zircon to diamond? (2 marks) 8. TIR only takes place when two conditions are met. What are they? ( 2 marks) Indices of Refraction Air nt=1.0003 Water nr=1.33 Ice nt=1.31 Acefone nr=1.36 Ethyl Alcohol ntt =1.36 Flint Glass nr=1.57 Crown Glass nt=1.52 Ruby and Sapphire nf=1.77 Diamond nr=2.42 Zircon nt=1.92 Opal nr=1.44 Azurite nt=1.76