Final answer:
The correct equation for the size of the image is the actual size of the object multiplied by the magnification. The correct option is A.
Step-by-step explanation:
The equation for the size of the image can be understood through the concept of magnification, which in physics is a ratio that describes the size of an image compared to the size of the object.
The correct equation for the size of the image is actual size of object times magnification, often represented as image size = object size x magnification (Option a). This means that to find the size of the image, you multiply the actual size of the object by its magnification.