Define the terms related to spherical mirror 1)pole 2)centre of curvature 3)radius of curvature 4)principle axis 5)principle focus 6)focal length
Answers
1) Pole: The centre of a spherical mirror is called its pole.
2) Centre of curvature: Centre of curvature of a spherical mirror is the centre of the hollow sphere of a glass of which the mirror is a part.
3) Radius of curvature: Radius of curvature of a spherical mirror is the radius of the hollow sphere of glass of which the mirror is a part.
4) Principal axis: The straight line passing through the centre of curvature and pole of a spherical mirror is called its principal axis.
5) Principal focus : it is a point onto which collimated light parallel to the axis is focused. Since light can pass through a lens in either direction, a lens has two focal points one on each side.
6) Focal length : 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. It is important to note up front that this is an approximately true relationship.