The International Prototype Kilogram (IPK) is an artefact standard or prototype that is defined to be exactly one kilogram mass. In metrology (the science of measurement), a standard (or etalon) is an object, system, or experiment that bears a defined relationship to a unit of measurement of a physical quantity. Standards are the fundamental reference for a system of weights and measures, against which all other measuring devices are compared.
Refraction. The bending of rays of light as they pass from one medium into another, e.g. from air to water, or from air to glass. Reflector ... Refraction. The bending of light rays by the glass element s inside a lens so that they converge and focus on a single plane in side the camera 's film or digital sensor.Scene. The place or environment viewed from camera position.hen light rays change path as they pass through one transparent object, such as a lens element, to the next. REFRACTION. As if this is not enough, there are more problems. When light travels from air to water it slows down as it meets the dense r medium..
Best Answer: Refraction is the change in direction of waves which occurs when waves travel from one medium to another. Refraction is always accompanied by a wavelength and speed change. Diffraction is the bending of waves around obstacles and openings. The amount of diffraction increases with increasing wavelength.efraction-is the change in direction of waves which occurs when waves travel from one medium to another Diffraction-is the bending of waves around obstacles and opening.