dot line). Extend the refracted ray. 11. Measure the angles of incidence and the angles of refraction. 12. Use your practical results to verify Snell’s Law. Results: *Refractive index for Perspex is 1.5. Experiment 1 n1 sinθ1 = n2 sinθ2 1 sin30° = n2 sin19.5° ∴n2 =1.497 (Refractive Index) Experiment 1 check 1.497 sin 19.5 = 1.5 sin19.5° 0.4997 ≈ 0.5 Experiment 2 n1 sinθ1 = n2 sinθ2 1 sin60° = n2 sin35°
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------------------------------------------------- Refractive index From Wikipedia‚ the free encyclopedia In optics the refractive index (or index of refraction) n of a substance (optical medium) is a dimensionless number that describes how light‚ or any other radiation‚ propagates through that medium. Its most elementary occurrence (and historically the first one) is in Snell’s law of refraction‚ n1sinθ1= n2sinθ2‚ where θ1 and θ2 are the angles of incidence of a ray crossing the interface between
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The Pros and Cons of Passive Management Ever since the introduction of passive index funds in the mid-1970s‚ there has been an ongoing debate over the merits of active versus passive management of pension fund assets. Each year articles chronicle the relative rise and fall in popularity of each approach to portfolio management. The advantages and disadvantages of each approach vary with the size of the portfolio as well as with the characteristics of the asset classes. In fact‚ there may be a place
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explained to me and did this project with me in group. INTRODUCTION TO INDEX NUMBERS An index number is an economic data figure reflecting price or quantity compared with a standard or base value. The base usually equals 100 and the index number is usually expressed as 100 times the ratio to the base value. For example‚ if a commodity costs twice as much in 1970 as it did in 1960‚ its index number would be 200 relative to 1960. Index numbers are used especially to compare business activity‚ the cost
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services were significantly lower than nowadays. The quantity of produced goods and services within the state shows the GDP. But how to measure the total cost of living? To answer this question we need to find out how to turn dollar into consumer price index (a relevant unit which measures the overall cost of goods and services purchased by a customer) to be able to compare cost of living over the time. Inflation – situation when total cost of goods and services increases. In this way expenditures of
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pay a higher or a lower price for the same goods or services. Very often we use index numbers to indicate these changes. In Form 4‚ we have learnt about Index Number from Chapter 11 in Additional Mathematics. Do you know what exactly Index Number is? Well‚ an index number is an economic data figure reflecting price or quantity compared with a standard or base value. The base usually equals to 100 and the index number is usually expressed as 100 times the ratio to the base value. For example
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price as the reference value‚ the gasoline price index for 1998 is 195.1 What was the cost of a gallon of gas in 1988 Index number = value / reference value x 100 Reference value = 55.6 Reference value in dollars = 55.6 / 100 = 0.556 *divide price given in cents by 100 to find the price in dollars * value = reference value x index number / 100 Calculate the cost of a gallon of gas in 1998 1990 price = 1975 price x index number / 100 0.556 x 195.1 / 100
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of Labor Statistics made the first attempt to gather data on the cost of living in the United States‚ introducing the cost-of-living index. In 1944 the government changed the name of its measurement from the "cost-of-living index" to the "consumer price index" (CPI)‚ when a presidential committee made a comprehensive study and concluded that the cost-of-living index did not reflect all changes in living costs.” (US History Encyclopedia‚ 2010). The difference in currency can also affect the
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Every living organism has a physiological rhythm. Some animal rhythms span from about a day (circadian) and other animal rhythms span to about a year (circannual). A physiological rhythm could mean the temperature of the species‚ frequency of movement‚ brain activity‚ etc. Most animals are active during the day time and some are more active during the night (Erkert‚ 2008). For example‚ a monkey increases its muscular movement during the day making the monkey more of a daytime animal (Krilowicz and
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procedures that answer questions regarding Snell’s Law and the index of refraction. Ultimately‚ the experimental procedures you develop will allow the index of refraction to be found for water and cooking oil. 1. Explain how to experimentally determine the index of refraction of two substances. 2. Develop a set of experimental procedures to find the index of refraction for water and cooking oil. 3. Calculate the index of refraction using Snell’s Law. 4. Explain critical angle and
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