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Deflection (f) in engineering. In structural engineering, deflection is the degree to which a part of a long structural element (such as beam) is deformed laterally (in the direction transverse to its longitudinal axis) under a load. It may be quantified in terms of an angle (angular displacement) or a distance (linear displacement).
Angles involved in a thin gravitational lens system. As shown in the diagram on the right, the difference between the unlensed angular position and the observed position is this deflection angle, reduced by a ratio of distances, described as the lens equation
By noting that, for small angles and with the angle expressed in radians, the point of nearest approach b 1 at an angle θ 1 for the lens L on a distance D L is given by b 1 = θ 1 D L, we can re-express the bending angle α 1 as
The curve () describes the deflection of the beam in the direction at some position (recall that the beam is modeled as a one-dimensional object). is a distributed load, in other words a force per unit length (analogous to pressure being a force per area); it may be a function of , , or other variables.
Deflection is a change in a moving object's velocity, hence its trajectory, as a consequence of contact with a surface or the influence of a non-contact force field. Examples of the former include a ball bouncing off the ground or a bat; examples of the latter include a beam of electrons used to produce a picture , or the relativistic bending ...
The degree of curvature is defined as the central angle to the ... Diagram showing different parts of the curve used in the formula. ... Substitute deflection angle ...
Smaller values of b bring the particle closer to the atom so it feels more deflection force resulting in a larger deflection angle θ. [ 47 ] : 82 The goal is to find the relationship between b and the deflection angle.
Vertical deflection is the reason why modern prime meridian passes more than 100 m to the east of the historical astronomic prime meridian in Greenwich. [2] The meridian arc measurement made by Nicolas-Louis de Lacaille north of Cape Town in 1752 (de Lacaille's arc measurement) was affected by vertical deflection. [3]