单词	spectroscope
释义	spectroscope An optical instrument that produces a spectrum for visual observation. The first such instrument was made by R. W. Bunsen; in its simplest form it consists of a hollow tube with a slit at one end by which the light enters and a collimating lens at the other end to produce a parallel beam, a prism to disperse the light, and a telescope for viewing the spectrum (see illustration). In the spectrograph , the spectroscope is provided with a camera to record the spectrum. For a broad range of spectroscopic work, from the ultraviolet to the infrared, a diffraction grating is used instead of a prism. See also spectrometer. Spectroscope
随便看	Poisson's ratio polar coordinates polar molecule polar vector polarimeter polarizability polarization polarization of light polarizer polarizing angle Polaroid polaron pole pollution polonium polychromatic radiation polygon polygon of forces polyhedron polynomial population inversion population type positive charge positive feedback positron

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