Relative size magnification is defined as:

• A. The enlargement is based on the object being moved closer to the observer.
• B. The size of the object at a given location is increased through optical principles.
• C. The object is physically enlarged.
• D. Magnification is accomplished through the use of electronic equipment.

Answer: (C)

Relative size magnification means the magnified appearance comes from increasing the actual size of the object itself. When you physically enlarge the object, its image subtends a larger angle at the eye at the same viewing distance, so it looks bigger without needing to move closer or use optical or electronic devices.

Moving the object closer changes how big it looks due to distance (angular size) rather than changing the object's true size, so that’s a different mechanism. Optical principles or electronic equipment produce magnification by altering the image formed, not by enlarging the object itself.