You look at the target and then at your tablet and see how far you were off and mark your actual impact point in relation to the sketch you drew. Repeat the process again, sketch the target, mark where you think you will hit, load one round, take a dead-on hold and see where you hit.ook at how the spoon handle appears to bend at the point it enters the water. This is an illusion caused by the difference in the index of refraction of air and water. The variation of air temperature between you and the target causes a change in the index of refraction of the air along your sight path.