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Light - Other Applications of Light
A laser is useful for cauterising.

Light - Other Applications of Light

This GCSE Physics quiz looks at other applications of light. 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. Laser light is described as being monochromatic and coherent which means that the crests and the troughs of the individual rays of light are perfectly aligned and so the light beam doesn't spread out much and is very intense. Scientists working for the NASA space agency have been able to measure the distance of the Moon extremely accurately by reflecting laser light off special reflectors left behind after the Apollo Moon landings.

1.
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
2.
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 fibres can be used to transmit light efficiently from one place to another
3.
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
4.
Which of the following are examples of optical fibres?
Endoscope
Digital audio optical connection
Telephone exchange coupling
All of the above
Optical fibres 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
5.
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
6.
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
7.
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
8.
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
9.
Which of the following is NOT an application of total internal reflection?
Endoscopes
Fibre Optic Broadband
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
10.
Optical fibres can be used to transmit which of the following?
Light
Electrons
Protons
All of the above
An optical fibre is a bundle of glass fibres of high quality. Optical fibres are very flexible
You can find more about this topic by visiting BBC Bitesize - Light

Author:  Martin Moore

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