1 yn A nλ/d 2 θn B (2n+1)λ/2d 3 β C nDλ/d 4 θ'n D Dλ/d 5 y'n E (2n+1)Dλ/2d

1:C;2:B;3:A;4:E;5:D 1:C;2:A;3:B;4:D;5:E 1:C;2:A;3:D;4:B;5:E 1:D;2:E;3:C;4:B;5:A

1:C;2:A;3:D;4:B;5:E

Important expressions in YDSE.