# Reflection of Light

Good Essays
914 Words
Grammar
Plagiarism
Writing
Score
Reflection of Light
Of course, we live in an imperfect world and not all surfaces are smooth. When light strikes a rough surface, incoming light rays reflect at all sorts of angles because the surface is uneven. This scattering occurs in many of the objects we encounter every day. The surface of paper is a good example. You can see just how rough it is if you peer at it under a microscope. When light hits paper, the waves are reflected in all directions. This is what makes paper so incredibly useful -- you can read the words on a printed page regardless of the angle at which your eyes view the surface.
Another way to make colors is to absorb some of the frequencies of light, and thus remove them from the white light combination. The absorbed colors are the ones you don't see -- you see only the colors that come bouncing back to your eye. This is known as subtractive color, and it's what happens with paints and dyes. The paint or dye molecules absorb specific frequencies and bounce back, or reflect, other frequencies to your eye. The reflected frequency (or frequencies) are what you see as the color of the object. For example, the leaves of green plants contain a pigment called chlorophyll, which absorbs the blue and red colors of the spectrum and reflects the green.
You can explain absorption in terms of atomic structure. The frequency of the incoming light wave is at or near the vibration frequency of the electrons in the material. The electrons take in the energy of the light wave and start to vibrate. What happens next depends upon how tightly the atoms hold on to their electrons. Absorption occurs when the electrons are held tightly, and they pass the vibrations along to the nuclei of the atoms. This makes the atoms speed up, collide with other atoms in the material, and then give up as heat the energy they acquired from the vibrations.
You can explain absorption in terms of atomic structure. The frequency of the incoming light wave is at or near the vibration frequency of the

## You May Also Find These Documents Helpful

• Best Essays

Spectroscopy is the study of light. A spectrophotometer is a machine used to determine the absorbance of light at any given wavelength. It does this by using a source of white light through a prism, which gives multiple wavelengths that can be individually focused (Ayyagari and Nigam, 2007). Substances are put into cuvettes that are glass or quartz containers that light can easily travel through. The light that is being focused travels through the substance gets absorbed by the substance and is reflected back and read by galvanometer which had the ability to detect electric currents (Verma, R). The absorbance reading is then given, absorbance is usually between 0.0 – 2.0, any higher than 2.0 may mean not enough light is getting through to the galvanometer (Bhowmik and Bose, 2011). When using the spectrophotometer it is necessary to use a control or blank to zero or tare the machine in between every new wavelength or concentration, this control is water (Ayyagari and Nigam, 2007). The correlation between the numbers acquired through spectroscopy can be seen using the Beer- Lambert Law. The Beer- Lambert law states that the amount of light absorbed at a certain wavelength is proportional to the concentration of the absorbing substance (Fankhauser, 2007).…

• 2210 Words
• 9 Pages
Best Essays
• Better Essays

This investigation used spectroscopy to evaluate light absorption in different solutions. A spectrophotometer was used in the lab to determine these values. A spectrophotometer is an apparatus used to “measure the absorption of radiation in the visible and UV regions of the spectrum and allows precise at a particular wave length” (Jones et al., 2007). The amount of light absorbed by a substance is directly in relation to the concentration of the solute and also the wavelength moving through the solute (Jones et al., 2007). This is commonly referred to as Beer’s Law and can be expressed as A= εl [C]. Beer’s Law equation measures the absorbency of light, making it an effective measure as spectrophotometers give exact values for absorbency (Jones et al., 2007).…

• 1273 Words
• 6 Pages
Better Essays
• Good Essays

Using a spectrophotometer, the absorbance, A, of a solution measured directly. FeSCN2+ is placed into the spectrophotometer and their absorbances at 447nm are measured.…

• 849 Words
• 4 Pages
Good Essays
• Good Essays

Absorbance is defined as a measure of the capacity of a substance to absorb light of a specified wavelength. Concentration is defined as the amount of solute per unit volume of solution. Beer’s law is defined as a method that relates the absorption of light to the properties of the material through which one substance like light is traveling. Calibration Curve is defined as a general method for determining the concentration of a substance in an unknown sample by comparing the unknown to a set of standard samples of known concentration.…

• 556 Words
• 4 Pages
Good Essays
• Better Essays

1. To understand how spectrophotometry can be used to determine the concentration of a light-absorbing substance.…

• 987 Words
• 4 Pages
Better Essays
• Good Essays

When atoms absorb energy, electrons move into higher energy levels, and these electrons lose energy by emitting light when they return to lower energy levels. Energy levels are fixed energies that electrons can have. Ordinary light is made up of a mixture of all the wavelengths of light. Light, consisting of waves consists of wavelength and frequencies that are inversely proportional to each other, so as the wavelength of light increases,…

• 1293 Words
• 6 Pages
Good Essays
• Satisfactory Essays

The intensity of light that passes through an absorbing solution is dependent on the concentration of the absorbing compound in solution. In other words the more material in the solution absorbs the light, the less light will get through. This relationship is expressed by Beer’s Law…

• 1196 Words
• 5 Pages
Satisfactory Essays
• Good Essays

dark, 24 cm, 30 cm, and 49 cm light treatments. The absorbance was measured in…

• 378 Words
• 2 Pages
Good Essays
• Good Essays

Structural colors are created from reflection, diffraction and refraction. At times, light can reflect away from an object creating many fragments, so it is said to be scattering. However, if the light changes speed while/before hitting a transparent object, it is…

• 787 Words
• 4 Pages
Good Essays
• Good Essays

1. The “total pigment” absorption spectrum provides us with the conclusive amount of light that was absorbed at that specific wavelength. Of which is made up through specific pigments that contribute to a segment of the total pigment absorption.…

• 826 Words
• 4 Pages
Good Essays
• Powerful Essays

The relationship between absorbance and concentration…

• 2090 Words
• 9 Pages
Powerful Essays
• Satisfactory Essays

Many compounds absorb a certain spectrum of visible light. Since Beer’s Law describe the relationship between molar absorptivity and concentration, one could use his equation A = kc to find the unknown concentration by the known absorptivity. The graph of absorption spectrum is represented by a linear regression. From the graph, one could deduct that as the concentration decreases, the absorptivity also decreases.…

• 456 Words
• 4 Pages
Satisfactory Essays
• Satisfactory Essays

When a light ray strikes a smooth interface separating two transparent materials (like air, glass, or water), the wave is partly reflected and partly refracted (or transmitted) into the second material. For an example of this, imagine you are outside looking at a restaurant window. You can probably see both the inside of the restaurant (from the refracted light) and some of the street behind you (from the reflected light). Similarly, a person in the restaurant can see some of the street scene, as well as a reflection of the other people in the restaurant.…

• 417 Words
• 2 Pages
Satisfactory Essays
• Powerful Essays

When light is shone upon the reaction mixture, the absorbance of the reaction mixture is directly proportional…

• 16750 Words
• 145 Pages
Powerful Essays
• Powerful Essays

Spectrophotometry is a method to measure how much a chemical substance absorbs light by measuring the intensity of light as a beam of light passes through sample solution. The basic principle is that each compound absorbs or transmits light over a certain range of wavelength. This measurement can also be used to measure the amount of a known chemical substance. Spectrophotometry is one of the most useful methods of quantitative analysis in various fields such as chemistry, physics, biochemistry, material and chemical engineering and clinical applications.…

• 1686 Words
• 7 Pages
Powerful Essays