ARefraction of light
BDispersion of light
CInterference of light
DDiffraction of light
Answer:
B. Dispersion of light
Read Explanation:
Dispersion is the phenomenon of splitting of white light into its constituent colors when it passes through a medium.
This occurs because the refractive index of the medium is different for different wavelengths (colors) of light.
Different colors of light travel at different speeds in a medium, causing them to bend at slightly different angles.
Rainbow Formation and Dispersion
Rainbows are formed due to the dispersion of sunlight by water droplets suspended in the atmosphere.
Sunlight, which is white light, enters a water droplet.
Upon entering the droplet, the light undergoes refraction and dispersion. The white light splits into its constituent colors (Violet, Indigo, Blue, Green, Yellow, Orange, Red - VIBGYOR).
These dispersed colors then undergo internal reflection at the back of the water droplet.
Finally, as the light exits the droplet, it undergoes another refraction, further separating the colors.
The observer sees the rainbow when the sun is behind them and the water droplets are in front.