Final answer:
To calculate the image size, use the formula 'image size = actual size x magnification.' The magnification is determined by the image-to-object height ratio and represented by the formula 'm = -di/do,' where 'di' is the image distance, and 'do' is the object distance from the lens.
Step-by-step explanation:
To calculate the size of the image, you would use the formula: image size = actual size x magnification. This means that the correct answer to the question 'How do you calculate the size of the image?' is a. actual size x magnification. The magnification is defined as the ratio of the image height to the object height and is represented by the formula m = -di/do, where di is the image distance and do is the object distance from the lens.
When working with lenses and understanding images, whether a real or virtual, inverted or upright, each type of image has a specific magnification associated with it that can affect the perceived size of an image when viewed through an optical instrument such as a microscope or telescope.