Consider the type of interference experienced by light recombining after the beamsplitter for each of the wavelengths and moveable mirror positions specified.

Wavelength: $8\mathrm{.}0$ um

Moveable mirror location: ZPD

Wavelength: $8\mathrm{.}0$ um

Moveable mirror location: $+4\mathrm{.}0$ um$,$ relative to ZPD

Wavelength: $8\mathrm{.}0$ um

Moveable mirror location: $+2\mathrm{.}0$ um$,$ relative to ZPD

Wavelength: $8\mathrm{.}0$ um

Moveable mirror location: $+1\mathrm{.}0$ um $,$ relative to ZPD

Wavelength: $4000$ nm

Moveable mirror location: ZPD

Wavelength: $4000$ nm

Moveable mirror location: $+4\mathrm{.}0$ um$,$ relative to ZPD

Wavelength: $4000$ nm

Moveable mirror location: $+2\mathrm{.}0$ um$,$ relative to ZPD

Wavelength: $4000$ nm

A$.$ Constructive Interference

B$.$ Destructive Interference

C$.$ Mixed interference.