Because when the electric bulb at night switched It emitted the light this light rays forms an image on our retina hence the bulb become visible at night
2 ans
When an electric bulb is switched on, the electricity is allowed to pass in its circuit and is converted into light energy. Thus, a bulb glows when switched on and the eyes perceives the light energy in the visible spectra which is given out by the bulb. Hence, the bulb becomes visible
