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It is named after the type of prism used in the instrument. A constant deviation prism has the property that the angle between light entering the prism (the incident light) and light exiting the prism (the emergent light) is always the same, no matter what the angle of the incident light to the prism.
See this link.What_is_the_difference_between_ordinary_prism_and_constant_deviation_prism
difference between ordinary prism and constant deviation prism
A spectrometer is used to measure properties of light. The most common usage is as an instrument attached to a telescope for astronomers to measure the chemical elements in a star.
No, constant is not a verb. It is an adjective or a noun, depending on its usage.
construction of spectrometer?
spectrometer spectrometer
we use mercury lamp instead of ordinary lamp because ordinary lamp has many wavelengths when mercury lamp has single wavelength so in constant deviation we use only mercury lamp.
A symbolic constant is a constant with a name, numeric constants are unnamed and must be retyped in the code on each usage. Generally use of symbolic constants is preferred as it makes the code self documenting and allows the compiler to catch typing errors in constant usage.
spectometer is an instrument wnich measures the light passes through a prism
It means that equilibrium may be attained at widely separated values.
spectrometer