# Question #59f88

Oct 2, 2017

For a path difference $\delta$ between the two interfering rays with wavelength $l a m \mathrm{da}$,
Conditions for interference -

Constructive interference -

$\delta = n l a m \mathrm{da}$

Destructive interference -

$\delta = \left(n + \frac{1}{2}\right) l a m \mathrm{da}$

where $n$ in either case is an integer.