A blue laser beam is traveling in a large glass block towards the glass-air inte

Question

A blue laser beam is traveling in a large glass block towards the glass-air interface. It is incident at exactly the critical angle and so is totally internally reflected with no laser power exiting the glass block. A red laser beam travels exactly at the same angle towards the same interface. The red laser beam
Answer

is also totally internally reflected and no laser power exits the glass block.

does not reflect internally, and all of the laser power exits the glass block.

is partially reflected internally, and some of the laser power exits the glass block very close to the normal to the surface.

is partially reflected internally, and some of the laser power exits the glass block very close to the plane of the surface.

Explanation / Answer

is also totally internally reflected and no laser power exits the glass block.

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