What must be the angle of the flint glass prism g By joining prism of...

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What must be the angle of the flint glass prism g By joining prism of two different glasses shown in the figure it is possible to obtain deviation without dispersion We then say that the prism is achromatic It is required to fit a 5 crown glass prism with a flint glass prism so as to achromatize the wavelength interval between the C and F spectra lines The D line is located in the yellow region of the spectrum and is taken as the mean ray between the C and F lines Indices of the crown glass for the C D F lines are pc 1 514 HD 1 517 pF 1 523 indices of the flint glass for C D F lines are u c 1 644 U D 1 650 F 1 664 2 25 3 flint glass crown glass

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