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When hydrogen and neon are mixed and heated, the gas becomes luminous, meaning that the atoms of hydrogen and neon are excited, and they emit light as they return to their ground state. This emitted light carries the signature of each element in the form of their unique spectral lines.

Hydrogen and neon atoms have known spectral lines. Hydrogen has its characteristic Balmer series lines in the visible spectrum, which includes H-alpha (red), H-beta (cyan-green), H-gamma (blue), and H-delta (violet). Neon, on the other hand, has its own distinct emission lines in the visible spectrum with several intense visible lines in the red, yellow, and green regions.

A prism is an optical component that disperses light into its constituent wavelengths. When the emitted light from the heated hydrogen and neon mixture passes through the prism, the light is separated into its component wavelengths, and each wavelength is bent by a different amount. This separation is called dispersion.

After passing through the prism, the dispersed light is projected onto a screen. We would observe a pattern of distinct, sharp, and brightly colored spectral lines corresponding to the characteristic wavelengths of emission for hydrogen and neon. The hydrogen spectral lines to be observed are H-alpha (red), H-beta (cyan-green), H-gamma (blue), and H-delta (violet). The neon spectral lines appear in multiple colors – intense red, yellow, and green lines. In conclusion, when the light emitted from a mixture of hydrogen and neon is passed through a prism and projected onto a screen, we would observe a combination of hydrogen's Balmer series spectral lines and neon's characteristic red, yellow, and green lines. This demonstration emphasizes the unique spectral lines for each element, which can be used to identify their presence in various applications such as astronomy, analytical chemistry, and physics.