The discussion revolves around the double-slit experiment, specifically focusing on the effects of laser intensity and wavelength on the appearance and measurement of bright fringes. Participants explore the relationship between wavelength, fringe separation, and the implications for measurement accuracy.
Participants express disagreement regarding the relationship between wavelength and the number of bright fringes, with some initially asserting that more fringes result from increased wavelength, while others clarify that this is incorrect. The discussion remains unresolved on the implications of these relationships for measurement accuracy.
Participants reference mathematical relationships and concepts related to the double-slit experiment, but there are unresolved assumptions regarding the definitions of terms and the conditions under which the relationships hold true.
The diffraction effect will enhance as the wavelength has increased, so the bright fringes will span wider. If the number of bright fringes has increased, the measurement will be more accurate.kuruman said:If you use a laser of higher intensity the locations where bright fringes appear will receive more photons per second so they will be brighter.
Why do you think that increasing the wavelength will increase he number of bright fringes? What equation do you have in mind? Also, in what way do you think the experiment will be improved if you increase the number of bright fringes?
I repeat, what mathematical equation says that the number of fringes increases as the wavelength increases? You need to understand this point before you start thinking about increasing the accuracy of the experiment.Jason Ko said:The diffraction effect will enhance as the wavelength has increased, so the bright fringes will span wider. If the number of bright fringes has increased, the measurement will be more accurate.
I think I've made thing wrong. mλ=asinθ, larger wavelength means larger θ, so fewer fringes will be formed.kuruman said:I repeat, what mathematical equation says that the number of fringes increases as the wavelength increases? You need to understand this point before you start thinking about increasing the accuracy of the experiment.
Also, you did not explain why more fringes means more accurate measurement. What exactly will you be measuring that will have its accuracy increased when you have more bright fringes?
Now you got the idea. So if you want to have more fringes, you have to decrease the wavelength.Jason Ko said:I think I've made thing wrong. mλ=asinθ, larger wavelength means larger θ, so fewer fringes will be formed.
Thks a lot!kuruman said:Now you got the idea. So if you want to have more fringes, you have to decrease the wavelength.