What happens whenlightis absorbed

Note this calculates for a plane parallel to the camera image plane. If the object/plane at a distance is at an angle to the camera image plane then this coverage holds only for the distance provided.  Note that lens distortion is also not accounted for which will affect coverage a bit.

Mouse over the information icons to get a description of the inputs and outputs. You can look up your camera on google to find a specification sheet. Search something like “Nikon D7000 specs”, or “Canon M100 specs”, etc. If your camera has a removable lens you may need to get the lens focal length separately.

What does it mean toabsorb light

absorption, in wave motion, the transfer of the energy of a wave to matter as the wave passes through it. The energy of an acoustic, electromagnetic, or other wave is proportional to the square of its amplitude—i.e., the maximum displacement or movement of a point on the wave—and, as the wave passes through a substance, its amplitude steadily decreases. If there is only a small fractional absorption of energy, the medium is said to be transparent to that particular radiation, but if all the energy is lost, the medium is said to be opaque. All known transparent substances show absorption to some extent. For instance, the ocean appears to be transparent to sunlight near the surface, but it becomes opaque with depth.

Absorb lightwavelength

How much can I capture in a photo, and how big will my pixels be? Use this calculator to determine the approximate coverage (field of view) and the ‘ground’ pixel size of a particular lens and camera at a given distance.

Pick your desired units (metric or imperial) in the third column for both inputs and outputs. As you change any value on the form, the calculations are done automatically and in realtime.

Typically this calculator is used in planning – that is, before you take photographs or maybe even before you have a camera.  It has a general use for any digital camera photography, but two specific uses relate to photogrammetry in fabrication tasks:

1.a) relates to the coverage calculation below, and 1.b) and 2. relate to the pixel size calculation below. You may have a camera or maybe planning on buying a  camera, and it can be useful to know how much it will capture in one photo, given constraints like distance from objects. And it may be useful to know how big the pixel will be on the object because this defines the precision.  This will impact your camera purchase decision.

5 things thatabsorb light

As radiation passes through matter, it is absorbed to an extent depending on the nature of the substance and its thickness. A homogeneous substance of a given thickness may be thought of as consisting of a number of equally thin layers. Each layer will absorb the same fraction of the energy that reaches it. The diagram shows a beam of waves passing from right to left through a series of layers (d1, d2, and d3) of a medium. If the fractional absorption is taken as 33 percent, or 1/3, after the beam passes through the first layer d1, its initial energy (E0) will be reduced to E0/3. One-third the energy E0/3 will be absorbed passing through layer d2, and the beam will enter layer d3 with energy 1/3 (E0/3), or (E0/9). Similarly, each successive layer absorbs one-third of the energy it receives. Thus, for radiation of a given wavelength, an infinitesimally thin layer will reduce the energy of a wave by a fractional amount that is proportional to the thickness of the layer. The change in energy as the wave passes through a layer is a constant of the material for a given wavelength and is called its absorption coefficient.

Substances are selectively absorbing; that is, they absorb radiation of specific wavelengths. Green glass is transparent to green light but opaque to blue and red, and hard rubber is transparent to infrared and X-rays but opaque to visible light. Thus, radiation of an unwanted wavelength may be removed from a mixture of waves by letting them pass through an appropriate medium. Those substances that are designed to absorb a particular wavelength or band of wavelengths are called filters.