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Q: Rays of which of the following colours show the highest deviation by a prism?
  • A. Red
  • B. Yellow
  • C. Violet
  • D. Green
Correct Answer: Option C - Light undergoes refraction when it enters the prism obliquely. Among the 7 constituent colours of light, violet light has the least wavelength and hence it deviates the most and red light having the largest wavelength deviates the least. Hence, the required order is violet, indigo, blue, green yellow, orange, red (VIBGYOR).
C. Light undergoes refraction when it enters the prism obliquely. Among the 7 constituent colours of light, violet light has the least wavelength and hence it deviates the most and red light having the largest wavelength deviates the least. Hence, the required order is violet, indigo, blue, green yellow, orange, red (VIBGYOR).

Explanations:

Light undergoes refraction when it enters the prism obliquely. Among the 7 constituent colours of light, violet light has the least wavelength and hence it deviates the most and red light having the largest wavelength deviates the least. Hence, the required order is violet, indigo, blue, green yellow, orange, red (VIBGYOR).