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Q. What are emissive and absorption spectra?
Emission spectrum:
When the light emitted straight from a source is examined with a spectrometer the emission spectrum is obtained. Each source has its own characteristic emission spectrum.
Absorption spectrum:
When the light released from a source is made to pass through an absorbing material and then examined with a spectrometer absorption spectrum is obtained.
Q. Movement of principal ray? In every case a principal ray moves from the head of the object to the plane of the lens. It passes through the plane of the lens as well as conti
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