Concentration on work is important in all sphere of life. Effective study is only possible if you study with full attention throwing off mind all the irrelevant thoughts which interrupt in the process of learning. Concentration means to throw off mind all unnecessary thoughts and converge all the mental capabilities on a point. Normally the rays of sun do not burn a paper, because these rays are dispersed but if the rays of sun are converged on paper with the help of lens, it burns the paper at once. Similarly converging your mental capabilities enables productive study – the power of concentration.