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Refraction Assignment *Be careful of UNITS, Significant Figures. CIRCLE or BOX your answer 1. Light goes from flint glass into ethanol. The angle of refraction in the ethanol is 25. What is the angle of incidence in the glass? (2 v= 1 marks) v=d/t nSEC/V's nisineEn sinOr 2. A thick sheet of plastic, n=1.450, is used as the side of an aquarium tank. Light reflected from a fish in the water has an angle of incidence of 35.0. At what angle does the light enter the air? Hint: light goes from water, through the plastic, to the air (2 marks) Indices of 3. The incident material remains constant. How does the angle of Refraction refraction change as: (2 marks) Air nr =1.0003 a. The index of refraction of the second medium increases Water nr =1.33 Ice nr =1.31 Acetone Ar =1.36 Ethyl Alcohol n b. The index of refraction of the second medium decreases =1.36 Flint Glass nr =1.57 Crown Glass nr =1.52 Ruby and Sapphire nr =1.77 4. What has a higher critical angle, crown glass or flint glass? (1 mark) Diamond nr =2:42 Zircon nr =1.92 Opal n =1.44 Azurite Or =1.76Refraction Assignment *Be careful of UNITS, Significant Figures. CIRCLE or BOX your answer 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)