Many Thanks akhil .
Can you plz let me know one more thing as i posted earlier but couldn't get a satisfactory answer.I am working on zemax spectroscopy tutorial as provided in this link i couldn't get why -1 diffractionorder whats the science behind selecting it not zero diffraction order ?.If you could clarify i will be really obliged.
Link from where the following pic is copied https://support.zemax.com/hc/en-us/articles/1500005578762-How-to-build-a-spectrometer-theory
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