light from a helium-neon laser (wavelength 632.8 nm) diffracts when incident on

Question

light from a helium-neon laser (wavelength 632.8 nm) diffracts when incident on a hair of thickness 0.040 mm, just as light passing through a narrow slit would. What is the angular width of the central diffraction maximum formed on a screen 4.60 m away from the hair? light from a helium-neon laser (wavelength 632.8 nm) diffracts when incident on a hair of thickness 0.040 mm, just as light passing through a narrow slit would. What is the angular width of the central diffraction maximum formed on a screen 4.60 m away from the hair?

Explanation / Answer

The angular width of the central diffraction maximum formed on a screen 4.60 m away from the hair is

theta = 2 L/ W

           = 2 (632.8 nm)/ 0.040 mm

          =0.03164 degree

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