The interference phenomenon can take place:

Two waves of equal amplitudes and wavelengths but differing in phases are superimposed. The amplitude of the resultant wave is maximum when phase difference is:

For constructive interference to take place between two monochromatic light waves of wavelength $\lambda$, the path difference should be:

Young’s double-slit arrangement is contained in a transparent chamber. If the chamber is evacuated, then:

When sodium lamp in Young’s double-slit experiment is replaced by an ordinary bulb (white light), then:

State the path difference between two waves reaching a point for constructive interference.