A$)$ Consider Bragg's Law for a one$-$dimensional system, when the distance between slits is $3$ nm and wavelength is $1\mathrm{.}8$A$.$a$)$ diffraction is observed angle will the third diffraction peak from the central peak be observedb$)$ the same diffraction is measured using X$-$rays with a wavelength of $0\mathrm{.}75$A$.$ Calculate the angle for the third diffraction peak for this wavelength$$