There are two contrasting views that light either consists of particles or waves. Light is a perplexing phenomenon puzzled by Ancient Greeks and scientists for years. Even Issac Newton developed incorrect theories on light‚ when he was the inventor and genius behind physics. It has been proved that light can be both a particle and a wave. Human eyes collect light that is reflected from a source. For example‚ the light from a pencil comes from the source of light in the sun and travels to the pencil
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Assume the CAVA confirms the existence of an unavoidable conflict. The congruent coloring requires the fixed color be chosen‚ and consequently the two top rims be congruent conflict free. The focus is on these two issues. Congruence of Two Vertices Within three colors‚ two vertices (p‚ q)V(G) can be in one of the congruence relation defined as: congruent c(p) ≅ c(q)‚ the resulting color c(q) always equals the selected color for c(p). anti-congruent c(p) c(q)‚ <p‚ q>E‚ the resulting color c(q)
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Chapter 1 Introduction 1.1 History of Free Space Optics Even though fibre-optic communications gained worldwide acceptance in the telecommunication industry‚ FSO communications is still considered relatively new. But optical communication‚ in various forms‚ has been used for thousands of years. The Ancient Greeks polished their shields to send signals during battle. In the modern era‚ semaphores and wireless solar telegraphs called heliographs were developed‚ using coded signals to communicate
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Alhazen Ibn al-Haytham‚ born 965ce – 1039ce an Arab /Persian scientist and polymath‚ also significant contributions to the principals of optics‚ as well as to physics‚ anatomy‚ astronomy‚ engineering‚ mathematics‚ medicine‚ ophthalmology‚ philosophy‚ psychology‚ visual perception‚ and to science in general with his early application of the scientific method. After being ordered by Al-Hakim bi-Amr Allah‚ the sixth ruler of the Fatimid Caliphate‚ to carry out this operation‚ he quickly perceived the
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POB II: Exam II Review Chapter 6: tour of the cell Microscopy: • Microscopes provide a window to the cell. • Most important tool in cytology • Resolution has improved understanding of cells. o Resolving power – the smallest distance between two objects that allows them to be seen as distinct objects. o Resolving power of the human eye is 0.1 mm • Light microscope – uses glass lenses and visible light to form a magnified image of an object. o Resolving power of about 100 nm (.0002 mm)
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Study guide for Microbiology Chapter 2 Name________________ 1. List and describe the sequence steps routinely used to identify bacteria. These are referred to as the “five I’s” in your text. 2. Define / describe each of the following as they apply to microbiology: a. Culture f. pure culture b. Inoculum g. contaminated culture c. Inoculation h. mixed culture d. Colony 3. Microbiologists employee a number of approached to acquiring a pure culture
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The telescope is an important astronomical tool that gathers and focuses electromagnetic radiation. Telescopes serve to both increase the angular size and the brightness of objects. When we speak about telescopes we are usually referring to optical telescopes‚ but many other types of telescopes also exist for other spectrum of electromagnetic radiation. It is unclear as to who it was that actually invented the telescope but Galileo Galilei is credited as being the first to use a telescope for
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What are some advantages and disadvantages of a light microscope and electron microscope? Some of the disadvantages of the light microscope include‚ that since it send light‚ the light waves are diffracted as they pass through the matter. Because of this‚ light microscopes can only produce clear images of objects to a magnification of about 1000 times. Another problem is that since most living cells are nearly transparent‚ you can’t see them. So you have to use dyes to stain them. The advantage
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1. What type of microscope would be used in the laboratory to observe very small objects or organisms on a slide? Please give reasoning behind the answer. Which microscope would be useful when studying the internal structure of a minute specimen? (2 points) An Electron microscope‚ because they have high levels of magnification and because they can magnify the tiny details of the specimen with great clarity 2. List two jobs where microscopes are used. Describe in what capacity. (2 points)
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Controlled assessment research Focus length of a lens- The most important characteristic of a lens is its principal focal length‚ or its inverse which is called the lens strength or lens "power". Optometrists usually prescribe corrective lenses in terms of the lens power in diopters. The lens power is the inverse of the focal length in meters: the physical unit for lens power is 1/meter which is called diopter Convex- The word convex means curving out or bulging outward‚ as opposed to concave
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