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Q: Which colour deviates the least when light passes through a prism?
  • A. Violet
  • B. Blue
  • C. Red
  • D. Green
Correct Answer: Option C - The red colour deviates the least when light passes through a prism. When a narrow beam of sunlight falls on one face of a prism, a band of colours resembling those of a rainbow are observed on the other side of the prism. The order of colours from the base of the prism is violet, indigo, blue, green, yellow, orange and red and is abbreviated as VIBGYOR. This phenomenon of splitting of light into its components colour is called dispersion.
C. The red colour deviates the least when light passes through a prism. When a narrow beam of sunlight falls on one face of a prism, a band of colours resembling those of a rainbow are observed on the other side of the prism. The order of colours from the base of the prism is violet, indigo, blue, green, yellow, orange and red and is abbreviated as VIBGYOR. This phenomenon of splitting of light into its components colour is called dispersion.

Explanations:

The red colour deviates the least when light passes through a prism. When a narrow beam of sunlight falls on one face of a prism, a band of colours resembling those of a rainbow are observed on the other side of the prism. The order of colours from the base of the prism is violet, indigo, blue, green, yellow, orange and red and is abbreviated as VIBGYOR. This phenomenon of splitting of light into its components colour is called dispersion.