A diffraction grating with 400 lines/mm is illuminated with light of wavelength 500nm. A very wide viewing screen is 2.0m behind the grating. The separation between two adjacent slits is four times the width of a slit. How many bright fringes are there within the central maximum of single slit?
选项:
A:4;
B:6;
C:7;
D:9
发布时间:2024-06-20 14:33:11