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Fraunhofer lines, Kirchoff's law - circuit, Spectroscope Connect is Gustav Robert Kirchhoff
Gustav Kirchhoff is the connection. He discovered caesium and rubidium using spectroscopy. Middle image (on the top row) is the spectroscope used by him. Third image is the visible spectrum.Left and right images are Kirchhoff's Current law and Voltage law respectively.
Spot on Priyanka......Yours is correct too Shishir......the post was to commemorate Kirchoff's birthday which was on 12th March......keep the quizzer alive.