Normal force is that what acts perpendicular to any surface.Its an action-reaction force pair perpendicular to body weight mg.

It is denoted as

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If its an inclined plane as given in figure the angle $\theta$ measured from the horizontal surface.

Then the strength of the normal force is given by

Where N is the normal force, m is the mass of body,g is gravitational field strength, $\theta$ is the angle tending to be measured from horizontal.

The inclination angle and the weight angle away from the normal will be the same.

The weight always acts straight towards the earth's center.

The normal force N is equal and opposite to the perpendicular force acting.

The inclination angle and the weight angle away from the normal will be the same.

The weight always acts straight towards the earth's center.

The normal force N is equal and opposite to the perpendicular force acting.