1.

For a plane transmission grating with 5000 lines/cm what are the the absent order spectra if the width of the opacity is twice that of the frequency?

A. 1<sup>st</sup>, 3<sup>rd</sup>, 5<sup>th</sup>,
B. 2<sup>nd</sup>, 4<sup>th</sup>, 6<sup>th</sup>,
C. 3<sup>rd</sup>, 6<sup>th</sup>, 9<sup>th</sup>,
D. 4<sup>th</sup>, 8<sup>th</sup>, 12<sup>th</sup>,
Answer» D. 4<sup>th</sup>, 8<sup>th</sup>, 12<sup>th</sup>,


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