Which of the following statement is correct regarding the propagation of light of different colours ofwhite light in air?(a) Red light moves fastest(b) Blue light moves faster than green light(c) All the colours of the white light move with the same speed(d) Green light moves with the mean speed as that of the orange light and blue light.
Question
Which of the following statement is correct regarding the propagation of light of different colours ofwhite light in air?(a) Red light moves fastest(b) Blue light moves faster than green light(c) All the colours of the white light move with the same speed(d) Green light moves with the mean speed as that of the orange light and blue light.
Solution
The correct statement regarding the propagation of light of different colours of white light in air is (c) All the colours of the white light move with the same speed.
This is because in a medium like air, light of all colors travels at the same speed. The speed of light changes when it moves from one medium to another (like from air to water), and this change in speed causes the light to bend, a phenomenon known as refraction. This is why we see different colors in a rainbow, because the light is being refracted (bent) by the water droplets in the air, and different colors are bent by different amounts. But within the same medium, all colors of light move at the same speed.
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