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Question: 18 welders use a logarithmic scale to identify protective eyewear...

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18. Welders use a logarithmic scale to identify protective eyewear. The shade number, n is given by the equation 7 log T where T is the fraction of visible light that the glass transmits a) What shade number should a welder use that will only transmit entering the glass? of the light b) Viewing a solar eclipse through #14 welding glasses is considered safe. What fraction of light do these glasses transmit? c) For doing furnace repairs, #2 welding glasses are sufficient. How many times as much visible light is transmitted by #2 welding glasses as by #14 welding glasses?
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