Oblique incidence applies to rays that are incident at some angle OTHER THAN at right angles (90 degrees) to the surface on which they are incident. Vertical incidence IS at right angles.
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oblique
An oblique line can be diagonal, sloping or slanted. It is not vertical, horizontal, parallel or perpendicular.
Volume = Area of rectangular face x Vertical distance between that face and the one opposite it.
No, it will always have one.
Oblique is neither vertical nor horizontal to a given line or surface