eviation. It should be borne in mind that when the light leaves theprism although the different wavelengths take different direc-tions, yet all the rays of any one wavelength remain parallelto one another till they strike the objective of the telescope.Therefore the latter converges the waves of… … BRIGHT-LINE SPECTRA 111 array of these images constitute the spectrum of the light inquestion. The eyepiece of the telescope forms an enlarged vir-tual image of the spectrum, just as it. would form a virtualimage of any very distant object which the objective fooussedin its focal plane. A…
Light
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