A diffraction grating has 1.2 × 104 rulings or lines uniformly spaced over a width w = 25.4mm. This grating is illuminated at normal incidence by yellow light from a sodium vapour lamp of wavelength 589nm. Determine the greatest angle at which an order can occur on either side of the center of the diffraction pattern?
The grafting spacing d is,
For diffraction pattern on either side of center n 1
For = 589nm We have,
= n
= 16.14
∴Ang θ≈16.14
Comments
Leave a comment