Would be at at 90 degrees to the surface, in other words at right angles. So a line which was perpendicular to a horizontal surface would be vertical.
a tangent
"Perpendicular" means at an angle of 90° to a given line, plane, or surface.
0 degrees
A horizontal line is a line perpendicular to the vertical.
No clue! look in ur txtbook?
The line perpendicular to a surface at a point is called the normal
A normal line is the name of the line drawn perpendicular to the surface where a light ray strikes.
A normal line is the name of the line drawn perpendicular to the surface where a light ray strikes.
A normal line is the name of the line drawn perpendicular to the surface where a light ray strikes.
The normal (ray).
Line perpendicular to the surface.
Perpendicular is a line drawn over a surface at an angle of 90 degrees.
a tangent
yes
If the field lines were not perpendicular to the surface, then they could be decomposed into components perpendicular and parallel to the surface. But if there is an E-field along the surface, the surface is no longer an equipotential.
When the line from the light source to the surface on which the shadow falls is perpendicular to that surface.
A normal line is the name of the line drawn perpendicular to the surface where a light ray strikes.