Lightis vital in the daily life of human beings seeing, reflection ofimages, photograph taking, research and other applications. Inparticular, the reversibility of light aspect has been used tounderstand the functioning of the human eye and how images are formedafter path of light passes through the iris too the retina.Experiments in path of light have enabled developments in reflectionof images using mirrors, development of real and virtual images usinglenses and in particular using the method of parallax to projectimages on screens as well as locating real images.
Thisaspect has seen scientist develop laboratory microscopes formagnifying specimens under study, designing and development ofprojecting devices like the video projectors(M. Mishchenko et al.2002:30) Experiments in refraction of light have seen development ofmagnifying glasses, compound microscope, telescope, the SLR camera,color filtration and color photography. In particular, experiments onpath of light using the pin hole camera has enabled development increating pictures, understanding of human physiology, light physics,chemistry, mathematics and other subjects.
Photographywith a pinhole Camera
Takingpictures with a pinhole camera is simple as the human eye. In thehuman eye for the image to be formed, light has to pass through thepupil, in the pinhole camera light gets through a small hole calledthe aperture. The camera has a shutter that shuts all light just likein the human eye we have the eyelids. The diaphragm opens to allowmaximum light in the camera just like the iris opens wide to allow inmore light (Heavens& Ditchburn, 1991: 123).
Thecamera’s film resembles the human eye retina in which an imprint ofthe image is formed. Similarly, just like the human eye closes whenflooded with much light the camera’s diaphragm shuts or stops downin bright light. Thecamera uses the same principle as the human eye when light passesthrough the iris to the retina. In the same way the human eye keepson focusing and refocusing, cameras have been designed to adjust tosituations and focus images clearly(Heavens & Ditch burn, 1991:123).
TheCamera body can be made from container that is easy to handle anddoes not allow stray light, bodies can be made from rectangular boxesor cans. Curved containers produce more surrealistic image thecontainer should be six inches and various shapes could be used toproduce creative images. The bottom of the container is used to holdthe film, while the lid serves as the light transport system(aperture, shutter). If the container allows stray light, a blackpaper should be placed inside(Heavens & Ditchburn, 1991: 123).
Inorder to make the aperture a one inch square hole is made on thecontainers lid and an aluminum foil is used to cover the hole. After,a small hole is pierced at the centre of the foil using a needle. Thepin hole allows rays of light through to the film striking the filmin tight clusters. The finer the rays of light passing through thepin hole the sharper the cluster hitting the film producing a betterimage. Large apertures allow more light leading to less focusedimage. A film (photo paper) can be loaded and the camera used to takepictures(Mishchenko et al. 2002).
Heavens,O. S. Ditchburn, R. W. ‘Insightinto Optics.’United States: JohnWiley & Sons.(1991). ISBN 978-0-471-92769-3.
M.Mishchenko, L. Travis, A. Lacis ‘Scattering,Absorption, and Emission of Light by Small Particles,’Cambridge University Press, 2002.
Mason,P. ‘TheLight Fantastic’.PenguinBooks.(1981). ISBN 978-0-14-006129-1Internet Resource
Staley,Richard "AlbertMichelson, the Velocity of Light, and the Ether Drift",Einstein`sgeneration. The origins of the relativity revolution,Chicago: University of Chicago Press, (2009), ISBN 0-226-77057-5