According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n1) on an other medium (refractive index m2); ?->(Show Answer!)

1. According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n1) on an other medium (refractive index m2);

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MCQ-> Modern science, exclusive of geometry, is a comparatively recent creation and can be said to have originated with Galileo and Newton. Galileo was the first scientist to recognize clearly that the only way to further our understanding of the physical world was to resort to experiment. However obvious Galileo’s contention may appear in the light of our present knowledge, it remains a fact that the Greeks, in spite of their proficiency in geometry, never seem to have realized the importance of experiment. To a certain extent this may be attributed to the crudeness of their instruments of measurement. Still an excuse of this sort can scarcely be put forward when the elementary nature of Galileo’s experiments and observations is recalled. Watching a lamp oscillate in the cathedral of Pisa, dropping bodies from the leaning tower of Pisa, rolling balls down inclined planes, noticing the magnifying effect of water in a spherical glass vase, such was the nature of Galileo’s experiments and observations. As can be seen, they might just as well have been performed by the Greeks. At any rate, it was thanks to such experiments that Galileo discovered the fundamental law of dynamics, according to which the acceleration imparted to a body is proportional to the force acting upon it.The next advance was due to Newton, the greatest scientist of all time if account be taken of his joint contributions to mathematics and physics. As a physicist, he was of course an ardent adherent of the empirical method, but his greatest title to fame lies in another direction. Prior to Newton, mathematics, chiefly in the form of geometry, had been studied as a fine art without any view to its physical applications other than in very trivial cases. But with Newton all the resources of mathematics were turned to advantage in the solution of physical problems. Thenceforth mathematics appeared as an instrument of discovery, the most powerful one known to man, multiplying the power of thought just as in the mechanical domain the lever multiplied our physical action. It is this application of mathematics to the solution of physical problems, this combination of two separate fields of investigation, which constitutes the essential characteristic of the Newtonian method. Thus problems of physics were metamorphosed into problems of mathematics.But in Newton’s day the mathematical instrument was still in a very backward state of development. In this field again Newton showed the mark of genius by inventing the integral calculus. As a result of this remarkable discovery, problems, which would have baffled Archimedes, were solved with ease. We know that in Newton’s hands this new departure in scientific method led to the discovery of the law of gravitation. But here again the real significance of Newton’s achievement lay not so much in the exact quantitative formulation of the law of attraction, as in his having established the presence of law and order at least in one important realm of nature, namely, in the motions of heavenly bodies. Nature thus exhibited rationality and was not mere blind chaos and uncertainty. To be sure, Newton’s investigations had been concerned with but a small group of natural phenomena, but it appeared unlikely that this mathematical law and order should turn out to be restricted to certain special phenomena; and the feeling was general that all the physical processes of nature would prove to be unfolding themselves according to rigorous mathematical laws.When Einstein, in 1905, published his celebrated paper on the electrodynamics of moving bodies, he remarked that the difficulties, which surrouned the equations of electrodynamics, together with the negative experiments of Michelson and others, would be obviated if we extended the validity of the Newtonian principle of the relativity of Galilean motion, which applies solely to mechanical phenomena, so as to include all manner of phenomena: electrodynamics, optical etc. When extended in this way the Newtonian principle of relativity became Einstein’s special principle of relativity. Its significance lay in its assertion that absolute Galilean motion or absolute velocity must ever escape all experimental detection. Henceforth absolute velocity should be conceived of as physically meaningless, not only in the particular ream of mechanics, as in Newton’s day, but in the entire realm of physical phenomena. Einstein’s special principle, by adding increased emphasis to this relativity of velocity, making absolute velocity metaphysically meaningless, created a still more profound distinction between velocity and accelerated or rotational motion. This latter type of motion remained absolute and real as before. It is most important to understand this point and to realize that Einstein’s special principle is merely an extension of the validity of the classical Newtonian principle to all classes of phenomena.According to the author, why did the Greeks NOT conduct experiments to understand the physical world?
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MCQ-> Directions : Read the following passage carefully and answer the questions given below it. Following the end of the Second World War, the United Kingdom enjoyed a long period without a major recession (from 1945 - 1973) and a rapid growth in prosperity in the 1959s and 1960s. According to the OECD, the annual rate of growth (percentage change between 1960 and 1973 averaged 2.9%, although this figure was far behind the rates of other European countries such as France, West Germany and Italy. However, following the 1973 oil crisis and the 1973-1974 stock market crash, the British economy fell into recession and the government of Edward Heath was ousted by the Labour Party under Harold Wilson. Wilson formed a minority government on 4 March 1974 after the general election on 28 February ended in a hung parliament. Wilson subsequently secured a three seat majority in a second election in October that year. The UK recorded weaker growth than many other European nations in the 1970s; even after the early 1970s recession ended, the economy was still blighted by rising unemployment and double-digit inflation. In 1976, the UK was forced to request a loan of $ 2.3 billion from the International Monetary Fund. The then Chancellor of the Exchequer Denis Healey was required to implement public spending cuts and other economic reforms in order to secure the loan. Following the Winter of Discontent, the government of James Callaghan lost a vote of no confidence. This triggered the May 1979 general electron which resulted in Margaret Thatcher's Conservative Party forming a new government. A new period of neo-liberal economics began in 1979 with the election of Margaret Thatcher who won the general election on 3 May that year to return the Conservative Party to government after five years of Labour government. During the 1980s most state-owned enterprises were privatised, taxes cut and markets deregulated. GDP fell 5.9 % initially but growth subsequently returned and rose to 5% at its peak in 1988, one of the highest rates of any European nation. The UK economy had been one of the strongest economies in terms of inflation, interest rates and unemployment, all of which remained relatively low until the 2008-09 recession. Unemployment has since reached a peak of just under 2.5 million (7.8 %), the highest level since the early 1990s, although still far lower than some other European nations. However, interest rates have reduced to 0.5 % pa. During August 2008 the IMF warned that the UK economic outlook had worsened due to a twin shock : financial turmoil and rising commodity prices. Both developments harm the UK more than most developed countries, as the UK obtains revenue from exporting financial services while recording deficits in finished goods and commodities, including food. In 2007, the UK had the world's third largest current account deficit, due mainly to a large deficit in manufactured goods. During May 2008, the IMF advised the UK government to broaden the scope of fiscal policy to promote external balance. Although the UK's labour productivity per person employed¡¨ has been progressing well over the last two decades and has overtaken productivity in Germany, it still lags around 20% behind France, where workers have a 35 hour working week. the UK's labour productivity per hour worked is currently on a par with the average for the sold EU (15 countries). In 2010, the United Kingdom ranked 26th on the Human Development Index. The UK entered a recession in Q2 of 2008, according to the Office for National Statics and exited it in Q4 of 2009. The subsequently revised ONS figures show that the UK suffered six consecutive quarters of negative growth, making it the longest recession since records began. As of the end of Q4 2009, revised statistics from the Office for National Statistics demonstrate that the UK economy shrank by 7.2% from peak to trough. The Blue Book 2013 confirms that UK growth in Q2 of 2013 was 0.7 %, and that the volume of output of GDP remains 3.2% below its prerecession peak; The UK economy's recovery has thus been more lackluster than previously thought. Furthermore The Blue Book 2013 demonstrates that the UK experienced a deeper initial downturn than all of the G7 economies save for Japan, and has experienced a slower recovery than all but Italy. A report released by the Office of National Statistics on 14 May 2013 revealed that over the six-year period between 2005 and 2011, the UK dropped from 5th place to 12th place in terms of household income on an international scale ¡X the drop was partially attrib10 uted to the devaluation of sterling over this time frame. However, the report also concluded that, during this period, inflation was relatively less volatile, the UK labour market was more resilient in comparison to other recessions, and household spending and wealth in the UK remained relatively strong in comparison with other OECD countries. According to a report by Moody's Corporation, Britain's debt-to-GDP ratio continues to increase in 2013 and is expected to reach 93% at the end of the year. The UK has lost its triple. A credit rating on the basis of poor economic outlook. 2013 Economic Growth has surprised many Economists, Ministers and the OBR in the 2013 budget projected annual growth of just 0.6 %. In 2013 Q1 the economy grew by 0.4 % Q2 the economy grew by 0.7 % and Q3 the economy is predicted to have grown at 0.8%.A new period of neo-liberal economics began in United Kingdom with the election of Margaret Thatcher after five years of Labour government. Margaret Thatcher came in power in
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MCQ-> Directions : In the following questions, choose the word/group of words which is MOST SIMILAR in meaning to the word / group of words printed in BOLD as used in the passage. Following the end of the Second World War, the United Kingdom enjoyed a long period without a major recession (from 1945 - 1973) and a rapid growth in prosperity in the 1959s and 1960s. According to the OECD, the annual rate of growth (percentage change between 1960 and 1973 averaged 2.9%, although this figure was far behind the rates of other European countries such as France, West Germany and Italy. However, following the 1973 oil crisis and the 1973-1974 stock market crash, the British economy fell into recession and the government of Edward Heath was ousted by the Labour Party under Harold Wilson. Wilson formed a minority government on 4 March 1974 after the general election on 28 February ended in a hung parliament. Wilson subsequently secured a three seat majority in a second election in October that year. The UK recorded weaker growth than many other European nations in the 1970s; even after the early 1970s recession ended, the economy was still blighted by rising unemployment and double-digit inflation. In 1976, the UK was forced to request a loan of $ 2.3 billion from the International Monetary Fund. The then Chancellor of the Exchequer Denis Healey was required to implement public spending cuts and other economic reforms in order to secure the loan. Following the Winter of Discontent, the government of James Callaghan lost a vote of no confidence. This triggered the May 1979 general electron which resulted in Margaret Thatcher's Conservative Party forming a new government. A new period of neo-liberal economics began in 1979 with the election of Margaret Thatcher who won the general election on 3 May that year to return the Conservative Party to government after five years of Labour government. During the 1980s most state-owned enterprises were privatised, taxes cut and markets deregulated. GDP fell 5.9 % initially but growth subsequently returned and rose to 5% at its peak in 1988, one of the highest rates of any European nation. The UK economy had been one of the strongest economies in terms of inflation, interest rates and unemployment, all of which remained relatively low until the 2008-09 recession. Unemployment has since reached a peak of just under 2.5 million (7.8 %), the highest level since the early 1990s, although still far lower than some other European nations. However, interest rates have reduced to 0.5 % pa. During August 2008 the IMF warned that the UK economic outlook had worsened due to a twin shock : financial turmoil and rising commodity prices. Both developments harm the UK more than most developed countries, as the UK obtains revenue from exporting financial services while recording deficits in finished goods and commodities, including food. In 2007, the UK had the world's third largest current account deficit, due mainly to a large deficit in manufactured goods. During May 2008, the IMF advised the UK government to Broaden
the scope of fiscal policy to promote external balance. Although the UK's labour productivity per person employed¡¨ has been progressing well over the last two decades and has overtaken productivity in Germany, it still lags around 20% behind France, where workers have a 35 hour working week. the UK's labour productivity per hour worked is currently on a par with the average for the sold EU (15 countries). In 2010, the United Kingdom ranked 26th on the Human Development Index. The UK entered a recession in Q2 of 2008, according to the Office for National Statics and exited it in Q4 of 2009. The subsequently revised ONS figures show that the UK suffered six consecutive quarters of negative growth, making it the longest recession since records began. As of the end of Q4 2009, revised statistics from the Office for National Statistics demonstrate that the UK economy shrank by 7.2% from peak to trough. The Blue Book 2013 confirms that UK growth in Q2 of 2013 was 0.7 %, and that the volume of output of GDP remains 3.2% below its prerecession peak; The UK economy's recovery has thus been more lackluster than previously thought. Furthermore The Blue Book 2013 demonstrates that the UK experienced a deeper initial downturn than all of the G7 economies save for Japan, and has experienced a slower recovery than all but Italy. A report released by the Office of National Statistics on 14 May 2013 revealed that over the six-year period between 2005 and 2011, the UK dropped from 5th place to 12th place in terms of household income on an international scale ¡X the drop was partially attrib10 uted to the devaluation of sterling over this time frame. However, the report also concluded that, during this period, inflation was relatively less volatile, the UK labour market was more resilient in comparison to other recessions, and household spending and wealth in the UK remained relatively strong in comparison with other OECD countries. According to a report by Moody's Corporation, Britain's debt-to-GDP ratio continues to increase in 2013 and is expected to reach 93% at the end of the year. The UK has lost its triple. A credit rating on the basis of poor economic outlook. 2013 Economic Growth has surprised many Economists, Ministers and the OBR in the 2013 budget projected annual growth of just 0.6 %. In 2013 Q1 the economy grew by 0.4 % Q2 the economy grew by 0.7 % and Q3 the economy is predicted to have grown at 0.8%.bBroaden
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