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The idea of convergence in economics (also sometimes known as the catch-up effect) is the hypothesis that poorer economies ' per capita incomes will tend to grow at faster rates than richer economies. In the Solow-Swan model, economic growth is driven by the accumulation of physical capital until this optimum level of capital per worker, which ...
Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]
Accommodative convergence is that portion of the range of inward rotation of both eyes (i.e., convergence) that occurs in response to an increase in optical power for focusing by the crystalline lens (i.e., accommodation). [1] When the human eye engages the accommodation system to focus on a near object, signal is automatically sent to the ...
Convergence rate definitions. Suppose that the sequence converges to the number . The sequence is said to converge with order to and with a rate of convergence if. for some positive constant if and if . [2][4][5] If the sequence converges but then other more technical rate definitions are called for. [6] This definition is technically called Q ...
Prism (optics) A familiar dispersive prism. An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base ...
Distance PD is the separation between the visual axes of the eyes in their primary position, as the subject fixates on an infinitely distant object. [2] Near PD is the separation between the visual axes of the eyes, at the plane of the spectacle lenses, as the subject fixates on a near object at the intended working distance. [3]
Eye glasses with an included prism power is the optical method to reduce a fixation disparity. Different procedures have been proposed to determine the required amount of prism for the individual. Based on prism-FD curves (Fig. 3b), one can find the aligning prism sP 0 that nullifies the naturally prevailing fixation disparity sFD 0. This test ...
Convergence clubs, in global economic theory, pertain to levels of international attainment. Groups of countries are classified based on educational levels, income per capita and other measurable factors. For example, countries considered "poor" tend to converge towards one another and create a convergence club at a low level of per-capita ...