Summary of what I've been doing

I'm a little behind on my blogs. So guess I'll just post what I have been working over the past weeks up at once.

So the week after spring break-- I've been working on learning about the science of light..here's an outline of science of light- I may have missed a few sections of the terms, it was just a lot to write down...so here's the link for reference

http://micro.magnet.fsu.edu/primer/lightandcolor/indes.html

I took these notes from the website:

http://micro.magnet.fsu.edu/primer/lightandcolor/indes.html

Electromagnetic Radiation
• Visible light, a phenomenon that is explained through a model based on rays and wavefronts
• Proposed in late 1600s by Dutch physicist Christiaan Huygens
• Electromagnetic radiation also known as radiant energy
• “Mechanisms by which visible light is emitted or absorbed by substances, and how it predictably reacts under varying conditions as I travels through space and the atmosphere, form the basis of the existence of color in our universe.”

Light: Particle or a Wave?
• Both because as certain times light acts as either particle or wave
• We know this through: refraction, reflection, interference, and diffraction, to the results with polarized light and the photoelectric effect

Sources of Visible Light
• variety of sources are responsible for emission of electromagnetic radiation, categorized according to spectrum of wavelengths generated by source
• shorter visible light waves produced by energy state fluctuations of negatively charged electrons within atoms
• shortest form of electromagnetic radiation, gamma waves
o result from decay of nuclear components at the center of atom
• visible light that humans can see is from a mixture of wavelengths whose varying composition is a function of the light source

Fluorescence
• Middle of 19 century by British scientist Sir George G. Stokes observed that the mineral fluorspar exhibits fluorescence when illuminated with ultraviolet light
o He made the word fluorescence
o Fluorescing light has longer wavelengths than the excitation light
o A phenomenon that has become known as the Stokes Shift
• Fluorescence microscopy- method of studying material made to fluoresce
o Either in natural form or when treated with chemicals capable of fluorescing
o Fluorescence microscopy devised in early 20th century by August Köhler, Carl Reichert, and Heinrich Lehmann
o Good for cellular biology

Speed of Light
• In 1983, speed of light is 299,792.458 kilometers per second by the Seventeenth General Congress on Weights and Measures
• Meter is defined as distance light travels through a vacuum during a time interval of 1/299,792,458 seconds
• Speed of light is rounded to 300,000 kilometers or 186,000 miles per second

Reflection of Light
• (and other forms of electromagnetic radiation) occurs when waves encounter a surface that does not absorb the energy of the radiation and bounces waves away from the surface
• Incoming light wave is referred to as an incident wave
• The wave that is bounced away from the surface is called the reflected wave

Refraction of Light
• Light travels in a straight line with no change of direction
• If the light impacts a boundary at any other angle other than 90 degrees ( it will pass through 90 degrees), then the light will be bent or refracted (basically when a wave of energy changes in direction)
• “Early scientist realized that the ratio between the angle at which the light crosses the media interface and the angle produced after refraction is very precise characteristic of the material producing the refraction effect.”

Diffraction of Light
• The bending or spreading out of waves
• Scientist have utilized diffraction of neutrons and x-rays to elucidate the arrangement of atoms in small ionic acids
• Magnetic lenses can focus diffracted electrons in the electron microscope
o Glass lenses are very useful for focusing diffracted light to form an optical image that can easily be viewed
Polarization of Light
• 1669 Erasmus Bartholin discovered that crystals of the mineral Iceland Spar ( calcite) produce a double image when objects are viewed through the crystals in transmitted light
o unusual phenomenon – “When the calcite crystals are rotated about their axis, one of the images moves in a circle around the other, providing strong evidence that the crystals are somehow splitting the light into two different beams.”
• Human eye lacks ability to distinguish between randomly oriented and polarized light
• Plane-polarized light can only be detected through an intensity or color effect

Fundamentals of Interference
• Close relationship between diffraction and interference occurs because they are actually manifestations of the same physical process and produce ostensibly reciprocal effects
• example is light reflected from a film of oil floating on water

Optical Birefringence
• “Anisotropic crystals, such as quartz, calcite, and tourmaline, have crystallographically distinct axes and interact with light by a mechanism that is dependent upon the orientation of the crystalline lattice with respect to the incident light angle.”
• When light enters the optical axis of anisotropic crystals
o it behaves in a manner similar to the interaction with isotropic crystals
o passes through at a single velocity
• when light enters a non-equivalent axis
o it refracts into two rays each polarized with the vibration directions oriented at right angles to one another, and traveling at different velocities
o termed double refraction or birefringence is exhibited to a greater or lesser degree in all anisotropic crystals

Color Temperature
• If color temp. of light source too low for film
o Photomicrographs will have an overall yellowish or reddish cast
• Will appear WARM
• If the color temp. of light sources is too high
o Will appear Blue

One of the weeks I've been reading from a book from the library, Light, Science and Magic
I'm still working on my outline for that

After that week...I've been practicing in the studio.. I took picture of sarah.
I practiced with the lighting that I did in the demo for the class. After that I tried to learn about RAW

So here are some pictures of the studio session and other of Raw in photoshop.