Violet, green, red and yellow are the four colours formed on a white screen when a polychromatic light is dispersed. The arrangement of colours in the decreasing order of wave lengths is :
A. green, red, yellow and violet
B. red, yellow, green and violet
C. violet, green, yellow and red
D. violet, green, red and yellow
Answer:B
Violet, green, red and yellow are the four colours formed on a white screen when a polychromatic light is dispersed. The arrangement of colours in the decreasing order of wave lengths is :
A. green, red, yellow and violet B. red, yellow, green and violet C. violet, green, yellow and red D. violet, green, red and yellow