Last 15 years ke actual exam questions — year-wise, subject-wise filter ke saath.
This demonstrates Rayleigh scattering, where shorter wavelengths (blue light) scatter more readily than longer wavelengths.
During the day, blue light is scattered throughout the sky, making it appear blue.
At sunset, light travels through a greater thickness of atmosphere to reach our eyes, causing blue light to scatter away, leaving only the longer wavelengths (red and orange) visible.
Options A, C, and D misunderstand the physical mechanisms involved in light scattering and atmospheric optics.