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Answer:
1. If the inner side of the spherical mirror is reflecting, it is called a concave mirror. If the outer side of the spherical mirror is reflecting, it is called a convex mirror. Concave mirrors can form inverted and real images and also virtual and erect images.
2. centre of curvature-the centre of a circle which passes through a curve at a given point and has the same tangent and curvature at that point.
pole-The point where the principal axis pierces the mirror is called the pole of the mirror
focus-The point of convergence or divergence is called the focus.
principal axis-a line passing through the center of the surface of a lens or spherical mirror
focal length- The distance from the pole to the center of curvature is called (no surprise, I hope) the radius of curvature (r). The distance from the pole to the focal point is called the focal length (f). The focal length of a spherical mirror is then approximately half its radius of curvature.
virtual image-Virtual image is formed when the light rays appear to be originating from a point but does not actually meet.