Refraction Flashcards

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1
Q

what is the formula to find the refractive index of a medium

A

n = c/cs

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2
Q

what is Snell’s law

A

n1Sin1 = n2Sin2

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3
Q

if n1>n2 then

A

theta1

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4
Q

when theta = critical angle then

A

the light is refracted at 90 degrees

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5
Q

if theta > critical angle then

A

total internal refraction occurs

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6
Q

what is the formula for the critical angle

A

Sin(critical angle) = n2/n1

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7
Q

what is material dispersion

A

when the material absorbs some of the light, this means it must be boosted or repeated, the lost energy heats up the cable

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8
Q

what is multimode dispersion

A

light at different angles takes different paths and this arrives at different times, leading to broadening of the signal and overlapping of the signal in parts, which reduces the frequency (the speed at which the information is traveling).

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9
Q

how do you avoid multimode dispersion

A

by increasing the critical angle of the cladding

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