jessicaoakes

Framing The World Through My Photographs

Light Theory

Whilst looking through my old college work from studio I found a document on the theory of light, which I re-read and found very useful.

ABSORPTION reaches them When light strikes a medium and is neither reflected nor transmitted (passed on), it is said to be absorbed.

Absorption of light
The fate of non-Reflected, non-Scattered light. The reason why black suits are difficult to light (and hot to wear) is that they absorb most of the light and convert it into heat.

Diffraction and Photography

Whenever light goes around an object or passes through an opening it spreads and

produces an interference pattern consisting of alternating light and dark regions. It’s what

causes the fuzziness at the edges of shadows. This phenomenon, known as diffraction, is

of concern to photographers because of the apertures in their lenses. Although smaller

apertures increase depth of field and reduce distortions caused by certain lens

imperfections, they also increase the amount of image degradation caused by diffraction.

The effects of diffraction have been quantified long ago by complicated mathematical

and numerical analyses for many kinds of apertures. Of particular relevance to

photography are the results for a circular aperture.

DISPERSION :The speed of light in a medium depends on the wavelength of the light. As light enters a more dense medium, the short waves, such as blue, are slowed more than the long waves, such as red.

Refraction
When light rays change path as they pass through one transparent object, such as a lens elements, to the next.

Inverse square law
A simple mathematical law that’s usually complicated by its description. The law states that light projected onto a surface is inversely proportional to the square of its distance from the source!

Refelection

1. The act of reflecting or the state of being reflected.

2. Something, such as light, radiant heat, sound, or an image, that is reflected.

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This entry was posted on May 3, 2013 by in Working With Light and tagged , .
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