XPFMember
XPRS Moderator
- Messages
- 4,555
- Reaction score
- 13,292
- Points
- 523
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?? :?
