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Q. The value of $ [a-b\,b-c\,c-a] $ is

JamiaJamia 2014

Solution:

$ 1\times {{10}^{-6}}=3.14\times {{10}^{-3}}\times 2\times r\times {{10}^{-2}} $ $ r=\frac{{{10}^{-6}}}{3.14\times {{10}^{-5}}\times 2} $ $ =0.016m=1.6\,\,cm $ $ \frac{{{C}_{1}}}{{{C}_{2}}}=\frac{\sin i}{\sin r} $ $ \frac{3\times {{10}^{8}}}{{{c}_{2}}}=\frac{\sin {{45}^{o}}}{\sin {{30}^{o}}}=\frac{0.707}{0.5} $ $ {{C}_{2}}=\frac{3\times {{10}^{8}}\times 0.5}{0.707} $