To solve the question of identifying the incorrect statement among the given options, we will analyze each statement one by one.
### Step-by-Step Solution:
1. **Analyze Statement A**:
- The statement claims that "sideness can be corrected using a convex lens."
- **Explanation**: Sideness, or astigmatism, can indeed be corrected using a convex lens. Convex lenses help in focusing light properly, thus correcting the vision.
- **Conclusion**: This statement is **correct**.
2. **Analyze Statement B**:
- The statement claims that "in case of the compound microscope, if the final image is formed at infinity, then the magnifying power and magnification will be equal."
- **Explanation**: In a compound microscope, if the final image is at infinity, the magnifying power (which is the ratio of the angle subtended by the final image at the eye to the angle subtended by the object at the eye) and the magnification (which is the ratio of the height of the image to the height of the object) are not equal. They are related but not the same.
- **Conclusion**: This statement is **incorrect**.
3. **Analyze Statement C**:
- The statement claims that "near-sightness can be corrected by using a convexo-concave lens."
- **Explanation**: Near-sightness, or myopia, is typically corrected using concave lenses, not convex-concave lenses. However, the term "convexo-concave" can refer to a combination of lenses, which may be used in some optical devices, but generally, concave lenses are the standard for correcting myopia.
- **Conclusion**: This statement is somewhat misleading but can be considered **correct** in certain contexts.
4. **Analyze Statement D**:
- The statement claims that "case-guaranteed Tasli scope is free from chromatic aberration."
- **Explanation**: A well-designed telescope, like a case-guaranteed Tasli scope, can indeed be designed to minimize or eliminate chromatic aberration, which is the failure of a lens to focus all colors to the same convergence point.
- **Conclusion**: This statement is **correct**.
### Final Conclusion:
After analyzing all statements, we conclude that **Statement B is incorrect**.
