White light is a composite of various wavelengths. In a double-slit experiment, each wavelength produces its own interference pattern with different fringe spacings. The central fringe remains white because all wavelengths overlap there constructively. However, away from the center, the fringes for different colors do not align perfectly, resulting in a series of overlapping colored fringes rather than simple monochromatic dark and bright bands.

White light is composed of a spectrum of wavelengths. Since the fringe width depends on the wavelength (β = λD/d), each color produces its own interference pattern with different spacings. The central fringe remains white because all wavelengths overlap there, but as you move outward, the fringes for different colors shift, resulting in a series of overlapping colored fringes.

Interference requires the superposition of coherent light waves from two or more sources. If one slit is covered, there is only one source of light. Without a second source to interfere with the first, the interference pattern disappears, leaving only a single-slit diffraction pattern on the screen. Thus, the characteristic interference fringes are no longer observed.

Interference fringes in a double-slit experiment are produced by the superposition of light waves originating from two coherent sources. If one slit is covered, the source of one wave is removed, leaving only a single slit. Without two coherent sources, the interference pattern cannot be formed, and only a single-slit diffraction pattern will be visible.

In a standard double-slit interference experiment, the intensity distribution follows a pattern where the fringe width β is given by λD/d. Under ideal conditions with monochromatic light and small angles, the mathematical derivation shows that the spacing between consecutive maxima (bright fringes) and minima (dark fringes) is identical, resulting in fringes of equal width across the pattern.

In a double-slit experiment, light undergoes diffraction as it passes through the narrow slits, causing the light to spread out. These diffracted waves then overlap and interfere with each other, creating an interference pattern on the screen. Therefore, the observed result is a superposition of both diffraction and interference effects.