lightXYZ tristimulus valuesbrightnessdominant wavelengthchromaticity coordinatesexcitation purityNo abstract is available for this article.doi:10.1111/j.1949-8594.1953.tb06867.xJohn W. GreenawaltRoosevelt Junior High School, Cleveland Heights, Ohio;
Refraction of light is one of the most commonly observed phenomena, but other waves like sound waves and water waves also experience refraction. Refraction makes it possible for us to have optical instruments such as magnifying glasses, lenses and prisms. It is also because of the refraction of...
The refractive indexnof a medium (e.g., water, olive oil, etc.), also called the index of refraction, is defined as the quotient of the speed of light in vacuumcand the speed of light in the mediumv. It is a dimensionless number that depends on the temperatu...
(1831) n. The refraction of light in two slightly different directions to form two rays or vector components. Each ray is polarized, and their vibration directions are perpendicular to each other. Furthermore, each ray has a different velocity, and therefore a different refractive index. See ...
A nonimaging lens consists of a solid body of light-propagating material defining a first light-refracting surface, a second light-reflecting surface and a third light-refracting surface. To redirect the generally parallel light rays of a directional light beam, the first light-refracting surface...
If such were the case, then an observer looking towards the sea horizon would see a ray of light in different directions for different initial curvatures of the wave-front. Suppose an observer from the bridge of a ship were looking at a search-light placed at sea-level at the extreme ...
In soft matter subject to reorientation, such as nematic liquid crystals, the nonlinear interaction with light allows tuning of the optical properties. We demonstrate that in such material a beam of light can experience either positive or negative refraction depending on input power, as it can ...
How does the action of the convex lens differ from that of a concave lens on a parallel beam of light incident on them? Draw diagrams to illustrate your answer.Solution:When a parallel beam of light is incident on a convex lens then the prism in the upper part bends the incident ray ...
A new degree of freedom of controlling wave- fronts can be attained by introducing abrupt phase shifts over the scale of the wavelength along the optical path, with the propagation of light gov- erned by Fermat’s principle. The latter states that the trajectory taken between two points A ...
the invention, the refractors are susceptible to bending or warping to some extent with practically no effect on their function, as the plane areas retain substantially even thickness and the curved areas varying thickness which cause the refraction of light the invention relies on for its ...