Explanation:
When a magnetic field passes through the boundary separating two different media, the normal component of the magnetic field intensity remains the same.

Reasoning:
The magnetic field intensity (H) is defined as the magnetic field strength per unit length. It is given by the equation H = B/μ, where B is the magnetic field strength and μ is the permeability of the medium.

When a magnetic field passes through the boundary separating two different media, the magnetic field strength (B) may change due to the difference in permeability (μ) of the two media. However, the normal component of the magnetic field intensity (H) remains the same.

This is because the normal component of H is defined as the component of H that is perpendicular to the boundary. Since the direction of H is perpendicular to the boundary, it remains the same regardless of the change in B or μ.

Example:
Consider an example where a magnetic field passes through the boundary between air and a ferromagnetic material. The magnetic field strength (B) may increase when it enters the ferromagnetic material due to the higher permeability of the material. However, the normal component of the magnetic field intensity (H) remains the same at the boundary.

Conclusion:
In conclusion, the normal component of the magnetic field intensity at the boundary of separation of two different media remains the same. This is because the direction of the magnetic field intensity is perpendicular to the boundary and is independent of the changes in magnetic field strength or permeability.