# Can light possibly bend to the other direction of the normal?

When light goes from a more dense medium to a less dense medium, it bends away from the normal, as in the image

When light goes from a less dense medium to a more dense medium it bends towards the normal, as in the pic

But is it possible that light turns all the way around the normal? I think it should be possible as it doesn't violate fermat's principle, or does it? (see the image that follows)

NOTE(1): I have specified the interface in pic 3 so as to show that this is not a case of total internal reflection
NOTE(2): please explain in regards to fermat's principle, as you would to a person just been introduced to ray optics

• Note that you shoudnt confuse density and refractive index. – jinawee May 24 '19 at 11:46
• – Tojrah May 24 '19 at 12:06