Chapter 14 Outline I. Refraction of Light A. Refraction is the bending of light at the boundary of two media. 1. It is caused by differences in the way light travels in the two media a) Light changes speed unequally. (1) One side of the light becomes slower/faster 2. If light is perpendicular to the new medium‚ light will not refract a) If the media have the same index of refraction‚ light will not refract B. Index of Refraction 1. How well light travels through a medium is measured by
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IMPORTANT QUESTIONS IN PHYSICS (CLASS XII) ELECTROSTATICS One mark questions. 1. If a point charge is rotated in a circle of radius r around a charge q‚ what will be the be the work done? 2. Does the electric potential increase or decrease along the electric line of force? 3. Give the relation between electric intensity and electric flux. 4. What is the dielectric constant of a metal? 5. What is the potential energy of two equal negative point charges 2μC each held 1m apart in air?
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When the ancient Greeks looked up into the night sky‚ they saw the form of Orion‚ the great hunter of Greek mythology. There are numerous versions of the story of Orion’s birth. In one version of the story a poor shepherd named Hyrieus was visited by three Greek gods‚ Hermes‚ Poseidon‚ and Zeus. Hyrieus showed his guests great hospitality by slaughtering an ox‚ which was the only animal he owned. The gods chose to award Hyrieus’ generosity by granting him his greatest desire‚ a child. The gods instructed
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(c) 65.2 light years. (1 parsec = 3.26 ly * 20) 3. (a) 10m would have the greater light gathering power (b) Both of the telescopes are in vacuum. The 10m one has area Pi r ^2‚ with r = 5m and the 2m one has r = 1. The ratio of Pi 5^2/Pi 1^2 = 25. Twenty-five times more light falls onto the large telescope. (c) The 10m telescope has a “Greater” light gathering power. (d) The factor would be about 25 times the light gathering
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Which planet of the Solar System is accompanied by two moons named for the Greek gods of fear and terror? 5. On what kind of diagram are stars plotted according to their surface temperature and luminosity? 6. A common problem with refracting telescopes is a fringe of false color around the image‚ caused by the inability of a large lens to refract all colors of the spectrum to a common focus. This is known as ______. 7. For a body in orbit around the Sun‚ the point in its orbit which
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troChapter 1: Charting the Heavens (Astronomy Today) SUMMARY The universe is the totality of all space‚ time‚ matter‚ and energy. Astronomy is the study of the universe. A widely used unit of distance in astronomy is the light year‚ the distance traveled by a beam of light in one year. Early observers grouped the thousands of stars visible to the naked eye into patterns called constellations. These patterns have no physical significance‚ although they are a very useful means of labeling regions
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Determination of Refractive Index of Prism using Spectrometer and Various Light Sources Dimain‚ Marion; Gonzales‚ Jade; Pancho Jr.‚ Ronel; Viloria‚ Matthew David College of Engineering‚ University of the Philippines‚ Diliman‚ Quezon City 1101‚ Philippines msdimain@yahoo.com jadegonzales019@yahoo.com ronelpancho@yahoo.com tewhmat.liv@gmail.com Abstract The study aims to measure the refractive index of a triangular prism using a spectrometer‚ utilizing different gas discharge tubes as light source
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a change in refractive index. A ray traveling along the normal (perpendicular to the boundary) will change speed‚ but not direction. Refraction still occurs in this case. Understanding of this concept led to the invention of lenses and the refracting telescope. Refraction can be seen when looking into a bowl of water. Air has a refractive index of about 1.0003‚ and water has a refractive index of about 1.3330. If a person looks at a straight object‚ such as a pencil or straw‚ which is placed at
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Isaac Newton was one of the most influential people of the Scientific Revolution. His ideas are framework for modern physics and forever changed what science is and how it’s conducted. Newton believed that all natural philosophy and phenomena could be explained by science and he set out to do just that throughout his life. He did research in optics‚ created the theory of universal gravity‚ wrote the three laws of motion‚ invented calculus and he was even able to calculate the shape of the earth.
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REFRACTION THROUGH A LENS Lens: Lens is a transparent refracting medium bounded by two curved surface which are generally spherical. Types of lens: Generally there are two types of lens: 1. Convex lens: It is a lens which is thicker at the middle and thinner at the edges. It is also called converging lens as the light rays converges on passing through it at a point. Focal length of convex lens is taken as positive. 2. Concave lens: it is a lens which is thicker at the edges and thinner at the middle
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