- #1
khaos89
- 8
- 0
Hello, I am trying to understand thin film (in air) interference but I have a problem:
I know we have destructive interference when \delta=(2m+1)\pi.
Now i can try to calculate the thickness of the film to get it, so
since \delta =\frac{4nt\pi}{\lambda} - \pi where t is the thickness,
I come to \delta=(2m+1)\pi=\frac{4nt\pi}{\lambda} - \pi
that leads me to t=\frac{\lambda(m+1)}{2n} instead of
t=\frac{m\lambda}{2n}
(n is the refractive index and m is the integer parameter)
Where am I wrong?
I know we have destructive interference when \delta=(2m+1)\pi.
Now i can try to calculate the thickness of the film to get it, so
since \delta =\frac{4nt\pi}{\lambda} - \pi where t is the thickness,
I come to \delta=(2m+1)\pi=\frac{4nt\pi}{\lambda} - \pi
that leads me to t=\frac{\lambda(m+1)}{2n} instead of
t=\frac{m\lambda}{2n}
(n is the refractive index and m is the integer parameter)
Where am I wrong?
