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A laser is useful for cauterizing.

# Light - Other Applications of Light

This Physics quiz is called 'Light - Other Applications of Light' and it has been written by teachers to help you if you are studying the subject at senior high school. Playing educational quizzes is one of the most efficienct ways to learn if you are in the 11th or 12th grade - aged 16 to 18.

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The obvious use of light waves is to enable us to observe things with our eyes, however, light is also used for communications and lasers. The word laser is made up from the initial letters of the words 'Light Amplification by Stimulated Emission of Radiation'. Lasers produce beams of light that are extremely intense and narrow.

1.
Lasers can be used for a variety of applications. Which of the following are lasers useful for?
Cutting
Cauterising
Burning
All of the above
The strength of the laser should be considered when dealing with each situation, as some may require stronger lasers than others
2.
What is the normal range of sight for a human eye?
25 cm to infinity
5 cm to infinity
10 cm to infinity and beyond
25 cm to about 1 m
As you get older, the near point (the closest point to your eye that is in sharp focus) usually increases which is why you may see older people holding things further away to read what is written
3.
Optical fibers can be used to transmit which of the following?
Light
Electrons
Protons
All of the above
An optical fiber is a bundle of glass fibers of high quality. Optical fibers are very flexible
4.
What is the definition for critical angle in optics?
The angle below which total internal reflection occurs
The critical angle is the angle of incidence above which total internal reflection occurs
The angle between the normal and the angle of incidence
The angle between the normal and the angle of refraction
Total internal reflection is the reason that glass fibers can be used to transmit light efficiently from one place to another
5.
Which of the following is NOT an application of total internal reflection?
Endoscopes
Telescopes
Tacky Christmas Decorations!
Telescopes rely on light passing through a series of lenses or reflection off a curved mirror to bring it to a focus
6.
What is the critical angle of a medium if its refractive index is 1.5?
40o
41.8o
50o
51.8o
Rearrangement of the refractive index equation
7.
Calculate the refractive index of a medium which has a critical angle of 52o.
1.15
1.27
1.32
1.44
sin c = 0.788, 1/0.788 = 1.27. Refractive index has no units and is always quoted as just a number
8.
Which formula correctly states the relationship between refractive index and critical angle?
refractive index = 1sin c
refractive index = 2sin c
refractive index = 12 sin c
refractive index = 23 sin c
Different transparent media have different refractive indices
9.
Which of the following are examples of optical fibers?
Endoscope
Digital audio optical connection
Telephone exchange coupling
All of the above
Optical fibers have found their way into most parts of our modern day lifestyles now. They are preferred to more conventional methods as they are more efficient and can be made smaller and more cheaply
10.
What is a laser?
A device that generates an intense beam of coherent monochromatic light
A device that generates an intense beam of coherent bi-chromatic light
A device that absorbs an intense beam of coherent monochromatic light
A device that absorbs an intense beam of coherent bi-chromatic light
Coherent means that all the lightwaves are 'in phase' (all their crests and troughs are lined up). Monochromatic means that the light waves in a laser beam all have the same wavelength
Author:  Martin Moore