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#6.) Design a single lens collimator to be used with a He-Ne laser(wavelength 632.8nm). Foal length...

#6.) Design a single lens collimator to be used with a He-Ne laser(wavelength 632.8nm). Foal length of the collimator is 50cm. What are the radii of the two surfaces for the spherical aberration to be minimum. Use BK7 glass.

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