Then, the retinas in your eyes catch the light reflection for your brain to interpret into the image of an apple.
然后你眼睛里的视网膜会将这光线反射的图像传输到你的大脑中,呈现出一个苹果的样子。
Crash Course 天文篇
While EMISSION nebulae glow due to their own light, REFLECTION nebulae are bright because — can you guess? — they reflect the light of nearby bright massive stars.
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light, which is visible to the human eye and is responsible for the sense of sight. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), or 4.00 × 10 to 7.00 × 10m, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths). This wavelength means a frequency range of roughly 430–750 terahertz (THz).