Simple Harmonic Motion:

                                            for a simple swinging pendulum

2 Point Source Interference:

Destructive (Nodal Lines)                                                            Constructive

    where L is distance from point to half way between the sources, Xn is the perpendicular distance from the point to the perpendicular bisector, d is the distance between the sources.

Young's Double Slit (also use double slit formula for diffraction gratings):

    where is the distance between 2 maxima or distance between 2 minima, L is distance to screen, d is the slit spacing

Destructive (dark/minima)                                                          Constructive (bright/maxima)

Single Slit:

where is the distance between 2 maxima or distance between 2 minima, L is distance to screen, W is opening width

is width of the central maximum

Destructive (dark/minima)                                                           Constructive (bright/maxima)

Interferometer:    Remember each fringe pair move (dark to dark OR bright to bright) represents a mirror movement of