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Keerthana

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K nice
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Your explanation is good but [1+1/n^2]tanA is the answer . Can you explain how ? I am confused .
Old stains of ink, tea/coffee and cooked food are hard to remove as over time, the liquid diffuses into the cloth as well. Since the stain is not just on the surface but has also been absorbed by the cloth, it is harder to remove it.
When a toxic gas such as nitrogen dioxide, sulfur dioxide, sulfur trioxide, chlorine or ammonia is accidentally released into the air it can cause extreme damage to all living organisms close to the point of leakage, however, when diffusion occurs, the

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