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Light is moving through a substance that has an $n$ value of 1.6, and the light is approaching another substance that has an $n$ value of 1.2.

At what angle of incidence will the light begin being totally internally reflected, rather than passing into the new substance?

A

${ \theta }_{ i }=\sin { ^{ -1 }(1/1.2) }$

B

${ \theta }_{ i }=\sin { ^{ -1 }(1.6/1.2) } $

C

${ \theta }_{ i }=\sin { ^{ -1 }(1.2/1.6) } $

D

${ \theta }_{ i }=\tan { ^{ -1 }(1/1.2) } $

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