SNC 2DI
Optics Assignment
Name: _______________________
1. Light travels through a medium at 1.24 x 10 8 m/s.
a. What is the index of refraction of this medium?
b. What is the medium?
2. Light travels from air into an optical fiber with an index of refraction of 1.68.
a. Sketch the path of light as it changes media.
b. In which direction does the light bend?
c. If the angle of incidence on the end of the fiber is 25o, what is the angle of refraction inside the fiber?
3. Light travels from water into a ruby at an angle of 50o. The angle of refraction is 35o. What is the index of
refraction for ruby?
4. Light travels from a medium with n = 1.25 into a medium of n = 1.34, at an angle of 27° from the normal to the
interface of the two media.
a. Will the speed of the light increase, decrease, or remain the same?
b. Will the light bend toward the normal, away from the normal, or not at all
5. Light travels from a medium with n = 1.63 into a medium of n = 1.42, along the normal to the interface of the two
media.
a. Will the speed of the light increase, decrease, or remain the same?
b. Will the light bend toward the normal, away from the normal, or not at all?
6. What is total internal reflection? What is meant by the term “critical angle”?
7. Light traveling through an optical fiber (n=1.55) reaches the end of the fiber and exits into air.
a. If the angle of incidence on the end of the fiber is 30 o, what is the angle of refraction outside the fiber?
b. How would your answer be different if the angle of incidence were 50 o?
8. A ray of light in pyrex glass makes an angle of incidence of 40° with a glass-water boundary.
a. What angle of refraction does the light make in the water?
b. What is the critical angle for this glass-water boundary?
9. What is the critical angle for diamond (into air)? How does this explain why it sparkles?
SNC2DI
Optics Assignment
Name: _____________________
1. Light travels through a medium at 1.24 x 10 8 m/s.
a. What is the index of refraction of this medium?
b. What is the medium?
2. Light travels from air into an optical fiber with an index of refraction of 1.68.
a. Sketch the path of light as it changes media.
b. In which direction does the light bend?
c. If the angle of incidence on the end of the fiber is 25o, what is the angle of refraction inside the fiber?
3. Light travels from water into a ruby at an angle of 50o. The angle of refraction is 35o. What is the index of
refraction for ruby?
4. Light travels from a medium with n = 1.25 into a medium of n = 1.34, at an angle of 27° from the normal to the
interface of the two media.
a. Will the speed of the light increase, decrease, or remain the same?
b. Will the light bend toward the normal, away from the normal, or not at all
5. Light travels from a medium with n = 1.63 into a medium of n = 1.42, along the normal to the interface of the two
media.
a. Will the speed of the light increase, decrease, or remain the same?
b. Will the light bend toward the normal, away from the normal, or not at all?
6. What is total internal reflection? What is meant by the term “critical angle”?
7. Light traveling through an optical fiber (n=1.55) reaches the end of the fiber and exits into air.
a. If the angle of incidence on the end of the fiber is 30 o, what is the angle of refraction outside the fiber?
b. How would your answer be different if the angle of incidence were 50 o?
8. A ray of light in pyrex glass makes an angle of incidence of 40° with a glass-water boundary.
a. What angle of refraction does the light make in the water?
b. What is the critical angle for this glass-water boundary?
9. What is the critical angle for diamond (into air)? How does this explain why it sparkles?