- #1
noobie!
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i would like to ask a que regarding physical optic,so let's nt beating abt the bush,
QUE:A laser beam is incident on a 1.50 x 10^4 grove per inch diffraction grating.The wavelength of the light produced by the laser is 6.30nm and the interference pattern is observed on a screen 2.00m from the grating.Determine maximum number of fringes that can be observed?
here goes the solution but I am nt really clear of the solution:
d sin teta = m X lamda
sin teta=m.lamda.N/l <1
m< l/2N ans is 2.69.
tis is my que,why d=l/N wat does it represents for l/N ?then why do sin teta=m.lamda.N/l <1?why?is it because of polarized light is lesser than 1 while unpolarized light bigger than 1?thanks for your help!![Smile :smile: :smile:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
QUE:A laser beam is incident on a 1.50 x 10^4 grove per inch diffraction grating.The wavelength of the light produced by the laser is 6.30nm and the interference pattern is observed on a screen 2.00m from the grating.Determine maximum number of fringes that can be observed?
here goes the solution but I am nt really clear of the solution:
d sin teta = m X lamda
sin teta=m.lamda.N/l <1
m< l/2N ans is 2.69.
tis is my que,why d=l/N wat does it represents for l/N ?then why do sin teta=m.lamda.N/l <1?why?is it because of polarized light is lesser than 1 while unpolarized light bigger than 1?thanks for your help!