Why are optical fibers important for communication? a. they can carry thousands
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Why are optical fibers important for communication? a. they can carry thousands of times the information that wires can. b. light goes faster than electricity c. they carry digital information-wires can't d. information can be sent with much lower attenuation than wires e. all of the above In optics, what is meant by an "interface"? a. optically connecting one computer to another. b. using the image created by on lens as the object for another lens c. when the crest of one wave lines up with the trough of another wave. d. none of the above. When a light ray traveling in air meets the surface of a piece of glass, which of the following occur at the interface? a. the light is totally reflected b. some of the light is reflected back into the air. c. some light enters the glass and is refracted toward the normal. d. some light enters the glass and is refracted away from the normal... e. all of the light enters the glass. When you look into a pool of water, the depth looks less than it actually is because of a. interference b. diffraction c. specular-reflection d. refraction e. polarization Why would a decrease in the amount of ozone in the atmosphere increase the likelihood of people getting sunburn? a. global temperatures would rise. b. more ultraviolet radiation would reach the ground. c. we would be exposed to more infrared radiation. d. the premise is incorrect-ozone and sunburn are not related In air a light source emits a wavelength of 630 nm. Under water the wavelength of this light will be: a. 630 nm b. less than 630 nm c. more than 630 nm d. unpredictableExplanation / Answer
12. e) all of the above
All the options are true. The information capacity of fibres are high. Light travel 31% faster in fibres than electron travel in wires. Wires can carry analog signal while fibres can carry digital signals. Attenuation in fibres are less.
13. d) none of the above
Interace is a surface which connects the two mediums having different refractive indices.
14. c) some light enters the glass and is refracted towards the normal
When the light from air enters the glass, a small part of it gets reflected and the remaining enters the glass. According to Snell's law of refraction, the light entering the glass will be refracted towards the normal because the refractive index of glass is more than than that of air.
15. d) refraction
According to Snell's law of refraction, the light coming out from the pool of water gets refracted away from the normal. This results in the less depth of the pool.
16. b) more ultraviolet radiation would reach the ground
Ozone layer absors the UV radiation. The decrease in amount of ozone in atmosphere will lead to high transmission of UV. UV has high energy which results in sun burn.
17. a) 630nm
The wavelength or frequency of the light source is independent of the medium. The speed of propagation changes from one medium to another.
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