PRACTICE QUIZ 17A

Answer the following questions completely and clearly.

1. Name and describe the two kinds of reflections.

  

2. Name the property that determines the speed of light through a material.

3. Define refraction.

  

4. How will the angle of refraction compare to the angle of incidence for a ray of light moving from a more optically dense medium to a less optically dense medium?

  

5. What can you say about the optical density of a medium with a high index of refraction?

  

6. What is total internal reflection and when does it occur? Can a light ray traveling in air be totally reflected off water if the angle is right?

  

 

7. Give the mathematical expression of Snell's Law.  

8. How does an optical fiber (in fiberoptic cable) work?

 

 

9. How does a prism separate white light into a spectrum?

 

 

 

10. How is a rainbow created?

 

 

  

Solve the following. Show all work and circle your answer.

11. The speed of light in ice is 2.29 x 10⁸ m/s. What is the index of refraction of ice?

 

  

12. A diver shines a flashlight upward from beneath the water at a 28^o angle. At what angle does the light leave the water?

 

 

 

 

 

13. Rays of the sun are seen to make a 15^o angle to the normal beneath the water. At what angle above the horizon is the sun?

 

 

 

14. What is the critical angle for fused quartz glass (n = 1.46)?

 

 

 

15. A light ray enters a rectangle of crown glass (n = 1.52) at an angle as shown. Trace the path of the ray until it leaves the glass. Label all angles of incidence, reflection, and refraction and indicate their values in degrees.