Calculation of depth, apparent depth
1. Looking tilt
2. Looking straight
.If the object is in the medium (n) with the refractive light. The eyes are in the mid n observer (unit) with refractive light. The effect is to visualize the near surface joint medium (if people are in the air, look at objects in the water.If, on the other hand, objects are in the medium (n) with the refractive light. The eyes are in the mid n observer (unit) with refractive light. As a result they see in the near surface medium more seamless (if black water, look at the objects in the air.
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