What is the direction of light?

The direction of light is smooth light, backlight, side light, side smooth light, side backlight, top light and bottom light. The light in photography can come from any direction in the three-dimensional space with the subject as the center. For the convenience of expression, we use several general light directions, such as front light, back light, side light, side front light, side back light, top light and bottom light.

Light content

Light is a physical term, and its essence is photon flow in a specific frequency band. The light source emits light because the electrons in the light source gain extra energy. If the energy is not enough to make them jump into outer orbit, electrons will accelerate and release energy in the form of waves.

If the transition just fills the vacancy in the orbit and reaches the stable state from the excited state, the electron will stop the transition, otherwise the electron will jump back to the previous orbit again and release energy in the form of waves. The research history of light, like mechanics, was paid attention to in ancient Greece, and the law of light reflection was widely known as early as Euclid's time. However, before the separation of natural science and religion, human understanding of the nature of light hardly improved, only staying at the level of formal understanding of the spread and application of light.