Which scenario could indicate a long, narrow reflection path when beam divergence causes a reflection from a side surface before the back surface?

Which scenario could indicate a long, narrow reflection path when beam divergence causes a reflection from a side surface before the back surface?

• A. Multiple indications before the first back reflection
• B. Indications from multiple surface reflections
• C. Conversion from the longitudinal mode to shear mode
• D. Loss of front surface indications

Answer: (C)