the designed angle between the chordline of a hydroplane's wing and the water surface; the angle is fixed for ram wings but adjustable for auxiliary devices such as the horizontal stabilizer.

refers to the perpendicular angle of a strike on its target. This angle will give the greatest effect.

(Generally identified as , but sometimes as a "numbered" theta, such as 1.) The angle at which light strikes an interface between two media, measured between the path of the light and the normal to the interface. The images to the right show the angle of incidence, , between the green incident ray and the dotted line representing the normal. The image on the top depicts light being reflected at the interface, and the image on the bottom depicts light being transmitted and refracted at the interface. See this page of this module to learn more about measuring the angle of incidence.

The angle at which the light rays strikes the surface. Comments & Discussion

The angle between the direction of propagation of an electromagnetic or acoustic wave (or ray) incident on a body and the local normal to that body (although this normal may not be well defined, as that for a cloud, e.g.). May also describe beams of particles in the broadest sense. Compare angle of arrival.

The angle between the incident wave and the normal.

Angle between the normal to a surface and the direction of incident radiation; applies to the aperture plane of a solar collector. Most modern solar panels have only minor reductions in power output within plus/minus 15 degrees.

The angle measured from a perpendicular axis to the plane of a surface which energy arrives at. "Normal incidence" refers to the perpendicular direction of propagation to the surface. "Grazing Incidence" refers to energy arriving from the direction almost parallel to the surface (high incident angle"). Important in the performance of specular absorbers.

The angle between the chord line of a wing and the centre-line of the aeroplane.

The angle between the chord line of the mainplane of an aeroplane and the horizontal when the aeroplane is in the specified 'rigging position' on the ground. It should not be confused with the 'True Angle of Incidence' See Angle of Attack.

The angle between the incoming photons and the normal line. See reflection.

The angle formed between a beam of light striking a surface and the normal to that surface.

angle between the line joining the center of the solar disk to a point on an irradiated surface and the outward normal to the irradiated surface (a.k.a. incidence angle, incident angle) [--]   Einfallswinkel

The angle between the incident ray and the normal drawn to the point of incidence.

the angle that a line makes with a line perpendicular to the surface at the point of incidence

The angle of the incident ray (the light ray approaching) to the normal.

the angle between a wave front (usually an electromagnetic wave) or a wave ray and the plane of an interface that it meets; the angle of approach; important in refraction

the angle between the incoming ray and the normal (perpendicular to the surface)

The angle that the sun's rays make with a line perpendicular to a surface. The angle of incidence determines the percentage of direct sunshine intercepted by a surface.

The angle of incidence of a ray is the angle between the incident ray and the normal to the surface. Reflecting Light

The angle between the direct solar beam and the normal (90 degrees) to the active surface. (degrees)

For solar energy systems, the angle at which direct sunlight strikes the surface of the solar panel relative to perpendicular. Sunlight with an incident angle of 90 degrees is the most efficient.

Angle of the wing in relation to an arbitrary line fore and aft in the fuselage.

In reference to solar energy systems, the angle at which direct sunlight strikes a surface; the angle between the direction of the sun and the perpindicular to the surface. Sunlight with an incident angle of 90 degrees tends to be absorbed, while lower angles tend to be reflected.

Angle between the axis of an impinging light beam and a line perpendicular to the specimen surface.

The angle formed between a ray of light striking a surface and the normal line (the line perpendicular to the surface at that point).

The angle formed when light strikes a surface. The angle is measured between the incident light and an imaginary line perpendicular to the surface.

The angle between a ray of sunlight striking a surface and a line perpendicular to that surface. Rays perpendicular to a surface have a zero angle of incidence.

When a light source strikes something it is called incident light. When it reflects from the object it is called reflected light. The angle of incidence means the angle that the incident light hits the object. It is measured from a line that is perpendicular to the object.

The acute angle (smaller angle) at which a wave of energy strikes an object or penetrates a layer of the atmosphere or ionosphere.

when light strikes a surface it forms an angle with an imaginary line known as the :normal," which is perpendicular to the surface. The angle created between the incident ray and the normal is referred to as the angle of incidence.

The angle between the chord line of the wing and the longitudinal axis of the airplane.

the angle between the wing's chord and the longitudinal axis of an aircraft (a fixed value). The wings are typically mounted at a small positive angle of incidence, to allow the fuselage to be "flat" to the airflow in normal cruising flight. Report this Word Added by: aircowboy

The angle between the direction of the wave (incidence ray) and the line perpendicular to the surface the waves are striking (normal). Always equal to the angle of reflection.

(1) The angle between the direction of incoming EMR and the normal to the intercepting surface; (2) In SLAR systems this is the angle between the vertical and a line connecting the antenna and the target.

the angle at which radiation strikes a surface; measured from the normal to the surface.

the angle at which a ray of light (or radiation) strikes a surface. It is measured between the incoming ray and a perpendicular to the surface at the point of incidence (i.e., where the ray strikes).

The angle between an incident ray and the normal to a reflecting or refracting surface. Learn more about Angle of Incidence...

The angle that sunlight striking a solar module makes with a line perpendicular to its surface.

The angle that the chord of a wing makes with the direction of motion relative to the air. A particularly muddling term, as it is often measured as the distance in inches that the front spar is above the rear spar when the aeroplane is in the flying-level position

Angle between the reference axis (x-axis) of an airfoil and the reference axis of the aircraft (e.g. fuselage center line). Constant, built into the aircraft.

The angle between an incident ray and the normal to a reflecting or refracting surface. See also: Critical Angle; Total Internal Refection.

Light striking a surface is called "incident light." It becomes "reflected light" when it reflects from the surface. The "angle of incidence" is the angle at which the incident light strikes the surface, and is measured from a line that is perpendicular to the surface (called the "normal").

Angle between direction of motion of waves and a line perpendicular to surface the waves are striking

If you picture the wing as a flat sheet of material, the angle between the wing and the centerline of the fuselage. See Angle of attack, with which this is often confused.

(AOI): The angle formed by an incident ray of light and an imaginary line perpendicular to the plane of the component's surface. When the ray is said to be "normal" to the surface, the angle is 0 degrees.

The angle between the chord line of an aerofoil and the centre line of the airframe.

Angle that references the sun's radiation striking a surface. A "normal" angle of incidence refers to the sun striking a surface at a 900 (or perpendicular) angle.

The angle which a weapon, when delivered, strikes perpendicular or at a right angle to the target or surface intended, to bring about maximum results.

Describes the angle between the surface of an object and the direction of incident solar radiation. Solar cells produce most power when the cell surface is exactly perpendicular to the direction of sunlight. In solar parks, motorized trackers keep each cell pointed in the optimum direction as the sun moves across the sky.

The fore-and-aft angle at which a wing or tailplane is attached to the fuselage, in relation to the aircraft's horizontal axis. Not to be confused with angle of attack.

Angle that a light ray or electromagnetic wave striking a surface makes with a line perpendicular to the reflecting surface.

the angle between the incident ray (or wave) and a normal.

the angle between a ray of light incident on a surface and a line drawn normal to the surface.

When a light ray strikes a surface, the angle of incidence is the angle between the incident ray and the normal.

In any of several scientific and engineering disciplines, the term angle of incidence is used as a measure of how far from "straight" something is approaching a surface or structure.