This will not be the case with the regular test, in which you are to choose the one best answer to each question. As an object cools down, the light emitted has shorter wavelengths. Hotter objects emit more short wavelengths than cooler objects. A photograph taken with very low intensity light appears to be a somewhat random collection of dots.
Light passing through a very small pinhole spreads out on the other side.
When light falls on certain substances, free electrons are emitted. When an electric spark occurs, it produces visible light. An electric current will darken a photographic film. When electric current passes through a tungsten filament, it produces incandescence. When electrons escape from a highly-charged body, they glow in the dark.