Total internal reflection of a ray of light is possible when the ($i_c$ = critical angle,$i$ = angle of incidence)
- ARay goes from denser medium to rarer medium and $i < i_c$
- BRay goes from denser medium to rarer medium and $i > i_c$
- CRay goes from rarer medium to denser medium and $i > i_c$
- DRay goes from rarer medium to denser medium and $i < i_c$
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