Question

Define the following term 1) pole 2) centre of curvature 3) principle axis 4) principle focus

Answer 1

1.pole-the center of reflecting of a spherical mirror.
2.center of curvature-the reflecting surface of a spherical mirror forms a part of a sphere.The center point of this sphere is center of curvature.
3.principle axis-imaginary line passing through pole and center of curvature of a spherical mirror
4.principle focus-the point on principle axis from which rays appear to diverge after reflection or refraction .