total internal reflection Flashcards

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1
Q

what is total internal reflection?

A

when a light ray travels from a denser material to a less dense materials it can be reflected in the denser medium with no refracted ray

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2
Q

what are optical fibres?

A

drawn out glass or plastic where signals such as light as transmitted through via total internal reflection

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3
Q

what is the critical angle?

A

the angle of incidence above which total internal reflection occurs

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4
Q

how can critical angle be calculated?

A

sin(c)= 1/n

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5
Q

what 2 conditions does total internal reflection need to occur?

A

denser to less dense material and the angle of incidence must be greater than the critical angle of the object

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6
Q

what happens when light enters an optical fibre?

A

it bends towards the normal as the fibre is denser than air- the light then travels down the fibre as the fibre is denser than air via total internal reflection

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