Parallax error occurs when the apparent position of an object changes due to a change in the observer's position. This is often seen when reading a scale with a pointer, where the pointer's image migh
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Parallax error occurs when the apparent position of an object changes due to a change in the observer's position. This is often seen when reading a scale with a pointer, where the pointer's image might not align with the actual pointer if viewed from an angle.
If both the object and its image move together in the same direction relative to the observer, it means there is no relative shift between them as the observer's viewing angle changes. This indicates that the observer's line of sight is correctly aligned, or that the instrument is designed to prevent such a shift. In this specific condition, the parallax effect is absent.
Therefore, when the object and its image move together, there is no parallax error.
The correct option is (D).
The final answer is $\boxed{\text{D) no parallax error}}$.
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