Let, consider two diffraction gratings; one consists of 4000 lines per cm and the other one consists of 6000 lines per cm. Select the best statement beneath if comparing the dispersion of the two gratings.
i) The 4000 line grating generates the greater dispersion
ii) The 6000 line grating generates the greater dispersion
iii) Both gratings generate the similar dispersion; however the orders are sharper for the 4000-line grating.
iv) Both the gratings generate the similar dispersion; however the orders are sharper for the 6000-line grating.