Question

who is first person to use glass prism

Answer 1

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The first person to use Glass prism was Newton.

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Answer 2

 It was Isaac Newton who first thought that prisms split colours out of colourless light. Newton placed a second prism such that a separated colour would pass through it and found the colour unchanged. He concluded that prisms separate colours. He also used a lens and a second prism to recompose the rainbow into white light.