If the wavelength is changed to λ/2, does the central spot remain bright, does the central spot become dark, or do the fringes disappear? Assume the fringes are viewed by a detector sensitive to both wavelengths.

There is no graph to look at on here, but i shall explain them to you. a line graph is just in its title it’s a graph with a line running through the dots to show an increase or decrease. a bar graph is used to show how much or how little something is so a comparison. a scatter plot is used to graph points to tell the data. and i don’t know what a histogram is.