Diffraction Grating: a Thin Beam of Laser Light of Wavelength

question 26

Multiple Choice

Diffraction grating: A thin beam of laser light of wavelength 514 nm passes through a diffraction grating having 3952 lines/cm. The resulting pattern is viewed on a distant curved screen that can show all bright fringes up to and including ±90.0° from the central spot. If the experiment were performed with all of the apparatus under water (which has an index of refraction of 1.33) , what would be the TOTAL number of bright spots that would show up on the screen?

• A) 6
• B) 7
• C) 12
• D) 13
• E) 14

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