Light waves that are not coherent are typically characterized by?

• A. Consistent wavelength
• B. Random phase relationship
• C. Parallel propagation
• D. Both A and C

Answer: (B)

Light waves that are not coherent are characterized by a random phase relationship. Coherent light waves have a constant phase difference and typically share the same frequency and wavelength, which is why they can create stable interference patterns. In contrast, non-coherent waves lack this phase consistency; their phases fluctuate unpredictably over time. This results in varying amplitudes and a lack of organized interference, which is a significant characteristic of non-coherent light.

Consistent wavelength is associated with coherent light, where waves maintain a steady frequency and wavelength throughout. Similarly, parallel propagation is typically seen in coherent sources such as lasers. Thus, the primary distinguishing feature of non-coherent light is the random phase relationship, which impacts how these waves interact with other light and media.