Wasn't it Ziyan who wrote:
>Such as, from glas to air or from water to air.
>I know the critical angle of total reflectance from glas to air is 42 grad,
>and from water to air 49 grad.
>I tried times, but there's still refraction.
>How to achieve that?
>Thanks a lot.

Just position the water and your viewpoint to a situation where you'd
see total internal reflection in the real world, and you'll see the same
effect in POV. For example:

#version 3.6;
global_settings {assumed_gamma 1.0}
camera {location  <2.5,-0.5,-10> look_at <0,0,0> angle 27}
background {rgb 1}
light_source {<-30, 100, -30> color rgb 1}

// A tank of water
box {-<2,1,1>,<2,1,1> 
  interior {ior 1.2}
  pigment {rgbt <0.9,1,1,0.7>}
}

// Things to be reflected
// the floor
plane {y,-1 pigment {checker}}
// a box outside the water
box {<-2,-1,6><2,1,8> pigment {bozo}}
// something in the water 
sphere {<0,0.9,0> 0.1 pigment {rgb 0} scale <3,1,1>}

-- 
Mike Williams
Gentleman of Leisure

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