DOUBLE-SLIT EQUATION

L:  Distance between the slit and screen (m)

X_m:  Distance from the central maximum to the m^th maximum

λ:  Wave length (m)

m:  Order number (whole number, 1, 2, 3…)

d:  Distance between the slits (m)

m. λ = d.sin θ_m   (for maxima)

m. λ =   (for maxima)

sin θ_m =   (for maxima)

For minima (nodal lines), use  .λ

For mixama, use (m. λ)

∆_x::  Spacing between two maxima (or two minima).  It is constant.

λ = d.∆_x / L

1m = 10⁹ nm