The following questions are about the resolvance of diffraction gratings. 10. Define the resolvance of a diffraction in terms of average wavelength and difference in wavelength. 11. Explain why the resolvance of a grating is proportional to the number of lines N it has. 12. Explain why the resolvance of a grating is proportional to the order of diffraction m. Two lines of an emission spectrum are visible, having wavelengths of 475. 0 nm and 475.5 nm. A diffraction grating is illuminated with a beam of this light having a width of 0. 7500 mm. 13. What is the resolvance of this grating? 14. Find the minimum number of lines under the beam needed for the resolvance of the order 2 spectrum. 15. Will the order 1 spectrum be resolved? . Explain. 16. Find the minimum number of lines per mm needed in this particular diffraction grating. A spectroscope that uses a 2.35-cm diffraction grating having 725 lines per millimeter. Light incident on it having a wavelength of 475 nm. 17. Calculate the smallest difference in wavelength that can be resolved in the third order. 18. Find the resolvance of the grating. The following question is about the resolvance of CDs, DVDs, and BiuRay devices. 19. Describe the significance of resolution in the development of devices such as (205 (780 nm), DVDs (650 nm), and BluRav (405 nm)