An object is the bottom which has a 3.0 m deep water if this tilt angle up to 30 objects on the surface and you will see the object depth refractive index meters configuration of water is equal to 4/3.
One object on the bottom, which is 3.0 meters deep, if this object is tilted at an angle of 30 to the surface of the object is located a few meters deep, the refractive index of water equal to 4/3.
One object bottom which is the deep 3.0 meters. If you look at this object tilt angle 30 with water to see วัตถุนี้ deeper metres configure the refractive index of water were 4 / 3.