(4 points) Question 4: We observe that the light bends when it passes from a transparent medium to another. What is the underlying cause of such change of the direction of light? (4 points) Question 5: Which of the following statements is true: a) Speed of light travelling in a specific medium depends on the properties of that medium. b) Speed of light is the same in any transparent medium. c) Speed of light in air is different than speed of radio waves in air. d) Both (a) and (c) are correct. e) Both (b) and (c) are correct