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Fill in the blank: In 1666, Isaac Newton settled a longstanding debate on whether __________ were an inherent property of light or a result of external factors, using a combination of prisms and…

Question and options

Fill in the blank:
In 1666, Isaac Newton settled a longstanding debate on whether __________ were an inherent property of light or a result of external factors, using a combination of prisms and lenses.
  1. Colours
  2. Waves
  3. Shadows
  4. Sound

Answer and explanation

Correct answer: A - Colours
With his prism experiments, Newton showed that white light is a mixture of colours and that the colours belong to light itself rather than being created by the prism, so the word is "colours". The wave nature of light was argued later, and shadows and sound do not fit the prism experiment.

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