Light of wavelength 650 nm is normally incident on the rear of a grating. the first bright fringe (other than the central one) is at an angle of 5 ° with respect to the normal.
1)find the number of slits per centimeter in the grating.
/cm
2)two rays of light of wavelength 650 nm and 420 nm are normally incident on a different grating. if the grating has 5000 slits/cm, what is the angular seperation of of the two light rays' second order maximum.
|θ650 -θ420| =°
Answers: 3
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