Physics

If a scuba diver is underwater and looks up, he or she will see a round "hole" directly above him or her at the surface of the water. The rest of the surface will look like a mirror. Explain this phenomenon

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  1. snell's law

    light coming from right above comes straight down to the diver.
    however
    light coming from near the horizon hitting beyond the critical angle just reflects back up to the sky.

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  2. https://www.google.com/search?q=snell%27s+law+critical+angle+water+surface&client=firefox-b-1-ab&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwjFpb6xx5vfAhWPnOAKHclXA-gQsAR6BAgCEAE&biw=1366&bih=626#imgrc=ON8oZ_r0XK-34M:

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