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Physics 13 Online
OpenStudy (anonymous):

A diffraction grating with 500 lines/mm is illuminated by a light of wavelength 500 nm and projected on a screen placed 1.5 m away. a. What is the angle of diffraction for the first-order bright fringes? b. Is it justifiable to use the small angle approximation? Why or why not? c. Calculate the spacing between the bright fringes. d. How many bright fringes can be seen on the screen?

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