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Assalamoalaikum!!
can sumeone plz tell me for diff. grating formula dsinθ = nλ when do we use θ as 90 ?? i've seen in sum question sumtimes we use it as 90 to find n i think..?? why is that so?? :?
can sumeone plz tell me for diff. grating formula dsinθ = nλ when do we use θ as 90 ?? i've seen in sum question sumtimes we use it as 90 to find n i think..?? why is that so?? :?
