Which will give wider-spaced fringes in a double-slit experiment, red light or violet light?

Which has the longer wavelength....look at the formula for separation.

In a double-slit experiment, the spacing between the fringes is determined by the wavelength of light being used. The formula to calculate the spacing between the fringes is given by:

d = λ * L / D

Where:
- d is the fringe spacing
- λ is the wavelength of light
- L is the distance between the double-slit and the screen
- D is the distance between the two slits

Since the fringe spacing is dependent on the wavelength of light, longer wavelengths will result in wider-spaced fringes compared to shorter wavelengths. Hence, red light will give wider-spaced fringes compared to violet light.

To determine the effect of the wavelength on fringe spacing, you need to know the values of the other parameters in the formula (L and D). Additionally, you can measure or look up the wavelengths of red light and violet light and use the formula to calculate the fringe spacing for each one.