Which of the following statements is/are true?(i) A light field or plenoptic camera can refocus images after they are captured(ii) The sky is blue due to Compton scattering in the atmosphere(iii) RGB space is better for colour matching than UCS space

(i) True - A light field or plenoptic camera captures information about the light field emanating from a scene; that is, the intensity of light in a scene, and also the direction that the light rays are traveling in space. This contrasts with a conventional camera, which records only light intensity. This additional information allows users to refocus images after they are captured.

(ii) False - The sky appears blue not due to Compton scattering, but due to a phenomenon known as Rayleigh scattering. This is the scattering of light or other electromagnetic radiation by particles much smaller than the wavelength of the light. Shorter wavelengths (like blue and violet light) are scattered in all directions more so than other colors like red, orange, yellow, and green. However, our eyes are more sensitive to blue light and less sensitive to violet light. Additionally, some of the violet light gets absorbed by the ozone layer, further decreasing the amount of violet light. Therefore, to us, the sky appears blue.

(iii) False - RGB (Red, Green, Blue) space is not better for color matching than UCS (Uniform Color Space). UCS spaces are designed to represent color differences uniformly, meaning equal distances in the color space correspond to equal perceived color differences. This is not the case in RGB space, where a given distance can correspond to a small or large color difference depending on the specific colors. Therefore, UCS space is generally better for color matching than RGB space.