A typical reflection grating may have 1200 grooves/mm, which means the grooves are spaced at about _______ intervals.(a) 800 nm(b) 600 nm(c) 860 nm(d) 680 nmThis question was addressed to me in a national level competition.My query is from Methods of Monitoring Foetal Heart Rate in section Foetal Monitoring Instruments of Biomedical Instrumentation

A typical reflection grating may have 1200 grooves/mm, which means the

1.	A typical reflection grating may have 1200 grooves/mm, which means the grooves are spaced at about _______ intervals.(a) 800 nm(b) 600 nm(c) 860 nm(d) 680 nmThis question was addressed to me in a national level competition.My query is from Methods of Monitoring Foetal Heart Rate in section Foetal Monitoring Instruments of Biomedical Instrumentation
Answer» The correct choice is (a) 800 NM Explanation: A typical REFLECTION grating may have 1200 GROOVES/mm, which MEANS the grooves are spaced at about 800 nm INTERVALS. The grating may have a width of 20 mm or more, giving a total of at least 24,000 grooves.

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