You are designing a quick sketch procedure for a lab manual. Which pair of rays is guaranteed to be sufficient for locating the image in a thin-lens ray diagram when drawn correctly?

• A. Only the $P$-ray and $M$-ray for converging lenses, but not for diverging lenses
• B. Only the $P$-ray and $F$-ray
• C. Any two of the three principal rays
• D. Only the $F$-ray and $M$-ray

Answer: (C)