Which outcome occurs when two spatially separated but coherent laser beams illuminate a rough surface?

💡 Explanation

A speckle pattern becomes visible because constructive and destructive interference occurs; this phenomenon is modal interference which reveals surface variations beyond resolution limits; therefore a speckle pattern appears, rather than other optical effects which require perfectly smooth surfaces.

• Which effect results when impedance mismatch causes standing waves in coaxial cable?
• Which consequence results when matter warps spacetime excessively near objects with extremely high density?
• Which risk increases when a packed bed reactor catalyst becomes poisoned by sulfur compounds?
• Which outcome occurs when a transformer operates far above rated frequency?
• Which risk increases when optically pumped rubidium vapor lacks polarization control?
• Which consequence results when optical stress measurements neglect material birefringence?