What happens during the phenomenon known as 'light diffraction'?

• A. Light travels in a straight line
• B. Light bounces off a surface
• C. Light spreads out after passing through a slit or around an obstacle
• D. Light disappears completely

Answer: (C)

The phenomenon of light diffraction occurs when light waves encounter an obstacle or a slit that is comparable in size to their wavelength. As the light waves pass through the narrow opening or around the edges of an obstacle, they do not simply travel in straight lines but instead spread out and create a pattern of interference. This spreading effect results in a range of observable patterns, including bright and dark regions, which is a fundamental characteristic of wave behavior.

Diffraction is essential in various applications, including the study of wave properties, optical instruments, and even in understanding phenomena like the colors observed in a CD or DVD surface. The behavior of light during diffraction highlights its wave-like nature, contrasting significantly with the behavior exhibited when light travels freely in a straight line or is reflected off a surface.