Total internal reflect occurs: when moving from an optically dense (large n) med

Question

Total internal reflect occurs: when moving from an optically dense (large n) medium to a less optically dense one, for all angles when moving from a less optically dense (small n) medium to a more optically dense one, for all angles when moving from an optically dense (large n) medium to a less optically dense one, for rays near the surface normal when moving from an optically dense (large n) medium to a less optically dense one, for rays near the surface interface when moving from a less optically dense (small n) medium to a more optically dense one, for rays near the surface normal

Explanation / Answer

For total internal reflection condition is light travel from dense medium to a less dense medium (e.g. glass to air or water to air).

propagated wave strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface.

so third option

when moving from optically dense medium to less optically dense one for rays near the surface normal

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