vou botar a resposta em ingles por q é minha primeira lingua e conceitos mais abstratos como esse pra mim é mais facil explicar em inglies...
We are surrounded by Electro-magnetic radiation, from all objects which have a temperature above 0 degrees Kelvin. Michael Faraday at the Royal Institution, of Great Britain, Albemarle Street, London, 170 years ago, discovered the Electro and the Magnetic components. A radio receiver ‘tuned’ to the frequency of the broadcast station this can receive the Electro phase in a wire loop aerial, or the Magnetic’ phase in a ferrite rod. The broadcast station modulates the transmission with sound and the radio circuit separates this so we can hear it. In a similar way, the sun at 5000 degrees centigrade, emits Direct Light electro-magnetic radiation with both phases.
Day Light is the electro potential of sunlight and it radiates in a capacitive linear manner in all directions at the speed of light. We receive it by the vibration of free electrons through the crystal lattice of glass or the lens of our eyes and we can not see it. It can be modulated by electrons in the view by quantum discharges.
Direct Light has both electro-magnetic components in phase and is attenuated as the square of the distance over which it travels. It generally moves in straight lines and can be continuously captured by mass. During the time after it has modulated Day Light, it is attenuated as the square of the distance over which this has traveled before it is captured by the eye retina and used to focus the eye lens on the view.
Summary.
Day Light, is a potential without mass, which travels at the speed of light. It expands in all directions and is attenuated with distance in a linear capacitive manner. It can be modulated with Direct Light which has both the electro and magnetic components in phase from quantum discharge of electrons in the view. The energy of Direct Light can be continuously captured by mass, and is attenuated as the square of the distance over which it travels. The amount of time, after it's modulation of Day Light, but before capture by the retina, increases the observed distance and area of the view.