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- 1. Multiple Choice
The critical angle is the angle of refraction in denser medium in which the angle of incidence in less dense medium is 90º.
True
False
- 2. Multiple Choice
If the angle of incidence is larger than the critical angle of a medium, total internal reflection occurs.
True
False
- 3. Multiple Choice
Which diagram correctly describes the critical angle c for air-water surface?
A
B
C
D
- 4. Multiple Choice
Light travels through a glass block as shown. Which angle is the critical angle for light in the glass?
A
B
C
D
- 5. Multiple Choice
In which diagram is the path of the light ray NOT correct?
(Determine if the light ray is correctly bending towards or away from normal at each boundary)
P/S: Perspex is acrylic plastic.
A
B
C
D
- 6. Multiple Choice
The refractive index of a glass prism is 1.9. Determine its critical angle.
23o
30o
32º
35o
- 7. Multiple Choice
What happens to light during total internal reflection?
The angle of incidence is greater than the critical angle.
The angle of reflection is the same as the critical angle.
The angle of refraction is less than the critical angle.
The angle of incidence is zero.
- 8. Multiple Choice
Fiber optic cables work because of the principle of _____.
total internal refraction
incomplete internal refraction
total internal reflection
partial internal reflection
- 9. Multiple Choice
When angle of incident (i) equals to critical angle (c) if light is traveled from a denser medium to a less dense medium,
total internal reflection occurs.
angle of refraction is equal to 90 degree.
light is refracted out
light travel in straight line
- 10. Multiple Choice
What is total internal reflection
Where a wave is refracted at the boundary between a dense medium and a less dense medium when the angle of incidence is greater than the critical angle.
Where a wave is refracted at the boundary between a dense medium and a less dense medium when the angle of incidence is smaller than the critical angle.
Where a wave is reflected at the boundary between a dense medium and a less dense medium when the angle of incidence is greater than the critical angle.
Where a wave is reflected at the boundary between a dense medium and a less dense medium when the angle of incidence is smaller than the critical angle.
- 11. Multiple Choice
Give a reason why the signal changes direction at A
its a flat surface
the density of the glass is greater than the density of the air
the angle of incidence is more than 90 degrees
The density of the glass is less than the density of the air
- 12. Multiple Choice
What is the refractive index of a fibre optic pipe if the critical angle is 30 degree?
Outside is air.
2.0
1.7
2.4
- 13. Multiple Choice
Choose the correct statement that describes what happens to the ray of light if the critical angle is 48o and the angle of incidence is 48o
refract
totally internally reflect
travel along the boundary
- 14. Multiple Choice
_____ cables transmit beams of light without allowing any of the light to escape until it gets to the end of the cable.
Ethernet
Fiber optic
Armored
Coaxial
- 15. Multiple Choice
A ray of light travels from glass to air with an angle of incidence of 35o. If the critical angle is 42o what will happen at the boundary?
refract
totally internally reflect
travel along the boundary
reflect
- 16. Multiple Choice
A ray of light travels from air to glass with an angle of incidence of 45o. If the critical angle is 42o what will happen at the boundary?
refract
totally internally reflect
travel along the boundary
reflect
- 17. Multiple Choice
Light travels from glass (n=1.66) to water, what is the critical angle for these two mediums?
53.2
48.8
37
not possible
- 18. Multiple Choice
see image
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B
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D
- 19. Multiple Choice
see image
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B
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- 20. Multiple Choice
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- 21. Multiple Choice
see image
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- 22. Multiple Choice
see image
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- 23. Multiple Choice
see image
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- 24. Multiple Choice
see image
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