Define the following :-
Apperture....
Pole.....
Centre of curvature....
Principal axis....
Radius of curvature....
Principal focus.....
Focal length.....
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Answers
Answer:
Apperture :- In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane. ... One then speaks of a telescope as having, for example, a 100-centimeter aperture.
Pole :- The north pole of a magnet is the pole out of which magnetic lines of force point, while the south pole is the pole into which they point. ... Either of two regions of the Earth's surface at which magnetic lines of force are perpendicular to the Earth's surface.
Centre of curvature :- Centre Of Curvature = The geometrical center of the hollow sphere of which the spherical mirror is a part is called the centre of curvature. It is donated by C
Principal axis :- Principal Axis = The straight line passing through the center of curvature and pole of the spherical mirror is called the principal axis.
Radius of curvature :- In geometry, the center of curvature of a curve is found at a point that is at a distance from the curve equal to the radius of curvature lying on the normal vector. It is the point at infinity if the curvature is zero.
Principal focus:- Principle focus is the the line passing through the focus and centre of curvature to the pole of the mirror,a
Focal length :- the focal length is the distance between the focus and the pole of the mirror.
Centre of curvature (C): The centre of sphere of which lens is a part. Radius of curvature (R): The radius of sphere of which lens is a part. Principal axis: Line joining the centre of curvatures of two lenses. Optical centre (O): The point on the principal axis of a thin lens through which a ray of light passes undeviated. First focal point (F1): It is a point on the principal axis of the lens such that the rays of light starting from it (convex lens) or appearing to meet at the point (concave lens) after refraction from the two surfaces of the lens become parallel to the principal axis of the lens. Second focal point (F2): It is a point on the principal axis of the lens such that the rays of light parallel to the principal axis of the lens after refraction from both the surfaces of the lens pass through this point (convex lens) or appear be coming from this point. Focal plane: Plane passing through focus and perpendicular to the principal axis.Focus is defined as the point through which the reflected light rays pass (or appear to pass) when incident light rays are parallel to the principal axis. It is located at the midpoint of pole and centre of curvature. The distance between the pole and the focus of the mirror is called the focal length of the mirror. Note: Focal length of the mirror is a measure of power of the mirror.
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