Abstract
AT the London Optical Conference in 1950, it was suggested1 that the resolving power R of diffraction gratings might be increased by immersing the grating in a medium of high refracting index μi. Thus: 
where W is the ruled width of the grating and where α applies for the case of autocollimation of incidence and diffraction. This idea, which is a strict parallel to that of the immersion microscope, was further developed2 in accordance with Figs. la and b.
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References
Hulthén, E. Proc. London Opt. Conference 1950 p. 111.
Hulthén, E., Ark. Fys., 2, 439 (1950).
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HULTHÉN, E., NEUHAUS, H. Diffraction Gratings in Immersion. Nature 173, 442–443 (1954). https://doi.org/10.1038/173442b0
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DOI: https://doi.org/10.1038/173442b0
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