In a double-slit experiment, when white light is used instead of a monochromatic light source, such as a laser, the resulting pattern will be different due to the broad spectrum of wavelengths present in white light. Here's what you can expect:
Color Dispersion: When white light passes through the double slits, each individual wavelength or color component of the light will diffract and interfere differently. This results in a phenomenon known as color dispersion or chromatic dispersion, where different colors of light spread out or disperse at different angles.
Multiple Interference Patterns: Since each color component has a different wavelength, they will have different interference patterns. This means that instead of a single interference pattern observed with monochromatic light, you'll see multiple overlapping interference patterns corresponding to the different colors of light. These patterns will be superimposed on each other, creating a complex pattern with regions of constructive and destructive interference.
Broadened Fringes: The fringes or bright and dark regions in the interference pattern will be broader compared to the patterns produced by monochromatic light. This is because each color component will have a slightly different spacing between the fringes due to the variation in their wavelengths.
Blurring and Reduced Visibility: The overlapping interference patterns from different colors can result in blurring and reduced visibility of the fringes. The superimposed patterns can create a more diffuse and washed-out appearance, making it challenging to discern individual fringes or determine precise interference characteristics.
Overall, using white light in a double-slit experiment introduces complications due to the multiple wavelengths involved. While the interference phenomenon will still occur, the resulting pattern will be more complex, with broader and less distinct fringes compared to the sharper and well-defined patterns obtained with monochromatic light.