The correct option is 2 only
Explanation
Spherical mirrors are sections of a hollow sphere. Their geometric properties are defined by specific points and lines relative to the sphere of which they are a part.
Statement 1 is Correct.
The principal axis is defined as the straight line passing through the pole and the centre of curvature of the mirror. Geometrically, any line passing through the centre of a sphere is perpendicular (normal) to the surface of the sphere at the point of intersection. Since the principal axis passes through the centre of curvature and intersects the mirror at the pole, it is normal to the mirror at the pole.
Statement 2 is Incorrect.
The pole (P) is the geometric centre of the reflecting surface (the aperture) of the spherical mirror and lies on the mirror itself. The centre of curvature (C) is the centre of the hollow sphere of which the reflecting surface is a part. Therefore, the pole and the centre of curvature are two distinct points; the pole lies on the surface, while the centre of curvature lies outside the reflecting surface.
Key Takeaway:
The Pole is a point on the mirror surface, while the Centre of Curvature is the center of the sphere forming the mirror. The Principal Axis connects these two points and is always perpendicular to the mirror at the Pole.