(Answered) A transmission grating is used to study the spectral region

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A transmission grating is used to study the spectral region extending from 480 nm to 500 nm. The angular spread of this region is 20 degrees in the third order.

1.) Find the line density (number of lines per centimeter) of the transmission grating. Answer in units of lines/cm.

2.) How many orders are visible?

Please show all work and diagrams.

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