AT HS Applied Technology High School 3. The diagram below shows a fish in water of refractive index (4/3). a. Define critical angle. Is angle of incidence which angle of refraction of 90 degrees b. Find the critical angle for a water-air boundary. sin- ( 4 ) = 48.6 0 c. Use the result of part (a) and the fact that the path of a light ray is reversible, to predict and explain what a fish will see if it looks up toward the water surface at the following angles. i. 35.0 ii. 48.60 iii. 65.0 4. Diamonds are attractive because of their ability to reflect light. The critical angle for diamond in air is 24. a. Calculate the refractive index of diamond. b. Fig. 6.1 shows two diamonds of different shapes. A ray of light enters each diamond, as shown. On the figure continue the path of each ray of light until it emerges into the air. 70 450AT HS Applied Technology High School 5. The figure shows a ray of light that enters a semicircular glass block at A. At B, some of the light is reflected and some light leaves the glass and travels along the surface. 0.10m a. State the name of the angle of incidence marked 41. Bi b. Explain what is meant by total internal reflection. glass block c. Rays of light are incident at B with different angles of incidence as shown below. B B Figure (a) Figure (b) i. On the figure (a), the angle i, is less than 410. Draw the path taken by the ray of light after B. ii. On the figure (b), the angle iz is greater than 410. Draw the path taken by the ray of light after B. d. The speed of light in glass block is 2.0 x 108 m/s. The diameter of the glass block is 0.10 m. Calculate the time taken for the light to travel from A to B. 6. A performs an experiment with a semicircular glass block and a white light. Figure below shows the path taken by the ray of light as it enters the glass until it hits the straight edge at Q semicircular glass block white light The student finds that there is no change in direction as the ray enters the glass at P and that no light passes out of the glass at Q. i. Explain why the ray does not change direction at P.Bl on \"mm-nun whim-gm ii. Explain why no light passes out of the glass at Q. iii. On the gure, draw the complete path followed by this ray. iv. The student directs the ray of light into the glass along different paths, so that the angle 9 is slowly reduced. Describe what happens to the ray at Q. 7. Light passer. from air into a glass block of refractive index (3/2), as shown below. a. What is the angle of refraction in the glass? h. Find the critical angle of the light in glass. normal 57 c. The light strikes the surface AB at point P. Find the angle 9. d. What happens to the light ray at P