Final answer:
The position of the near reading area is most important when the reading area is small, as this dictates the effectiveness of the corrective measure being used, particularly in optical applications like eyeglasses for nearsightedness or farsightedness. Option D is correct.
Step-by-step explanation:
The question "The position of the near reading area becomes more important when the reading area is A) low B) high C) correct D) small" pertains to the optics involved in the positioning of reading areas, particularly when dealing with lenses or visual aids.
Considering the provided context and reference information, we understand that the position of the reading area is crucial for ensuring the image is seen clearly.
When the reading area is small (D), the position becomes especially important because it influences the size and clarity of the image perceived. A small reading area usually gives a wide range of view, and the image appears to be farther than the actual object.
For example, in the case of lenses as in eyeglasses or optical devices, a small reading area could mean less space through which to see the text or object clearly.
This could affect how the lenses correct vision, especially in the case of nearsightedness or farsightedness, where the focal points can either be between the lens and the retina, or on the retina, respectively. With a smaller reading area, the precision in positioning the reading area is crucial to make the best use of the lens's corrective power.
Therefore, the position of the near reading area becomes most important when the reading area is small (D), because it dictates the effectiveness of the corrective measure being used, such as a pair of glasses with concave lenses.