To see total internal reflection (not just partial reflection) at a swimming poo

Question

To see total internal reflection (not just partial reflection) at a swimming pool you have to be:
above the water looking into the water
below the surface of the water looking up toward the air
right at the surface of the water
all of the above
none of the above

Total internal reflection occurs when:
light is going from a material in which it travels slowly to one in which it travels faster
light is going from a material in which it travels faster to one in which it travels slower
light is going from a material into another material and travels equally fast through each
none of the above

Explanation / Answer

(a). below the surface of the water looking up toward the air (b).light is going from a material in which it travels slowly to one in which it travels faster

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