The visible part of light consists of the following colours

Jamb 1978

The visible part of light consists of the following colours: A. red, indigo, infra-red, violet, yellow, green and blue B. red, green, blue, violet, indigo, orange and yellow C. blue, ultra-violet, infra-red, red, yellow, indigo, violet, green and orange, D. infra-red and ultra-violet E. red, orange, yellow, green, blue, indigo and infra-red. 

ANSWER: Option B

EXPLANATION: 

R – Red

O – Orange

Y – Yellow

G – Green

B – Blue

I – Indigo

V – Violet

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