Question

Define: pole,centre of curvature, radius of curvature, principle axis, principle focus, focal length, paraxial ray, focal plane and aperture for a spherical mirror​

Answer 1

Explanation:

1. pole-the center of the mirror surface is called its pole.
2. centre of curvature- the centre of the sphere of which the mirror is a part is called centre of curvature.
3. the radius of the sphere of which the mirror is a part is called the radius of the curvature.
4. the straight line passing through the pole and centre of the curvature of a spherical mirror is called its principle axis.

5.the distance between pole and principle focus is called the focal length.

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Answer 2

Answer:

☺ The pole of a spherical mirror can be defined as the centre point of aperture of a spherical mirror. The centre of the reflecting surface of a spherical mirror is a point called the pole. The pole is usually represented by the letter P

☺Centre of curvature : The centre of sphere of which the mirror form a path is called centre of curvature. Focus : The point at which, a narrow beam of light incident on the mirror parallel to its principal axis, after reflection from the mirror, meets or appears to come from, is called the focus.

☺The principal axis of a spherical mirror is a line going through the center of the mirror that is exactly perpendicular (sometimes said "normal") to the surface of the mirror. By definition, a spherical mirror is rotationally symmetrical around its principal axis.

☺The principal focus of a spherical mirror is a point on the principal axis of the spherical mirror at which, the light rays which are parallel to the principal axis actually converge (meet) or appear to diverge after reflection

☺Focal length of the spherical mirror is defined as the distance of pole of mirror from the point on the axis of the mirror at which the rays, parallel to the principle axis, appear to converge. In other words, distance between the pole of mirror and the focus point called as the focal length of mirror

☺Paraxial rays are ones which originate from a point source and make a small angle with principle axis. After reflection, they give a point image, either real or virtual. But if rays from point source that are far from the mirror axis, gives a blurred image, an effect called as spherical aberration.

☺A focal plane for mirrors usually exists for spherical mirrors. The PRINCIPAL focus of a spherical mirror is a point on the PRINCIPAL axis of the mirror where light rays PARALLEL to the PA converge (for a concave mirror) and diverge from (for a convex mirror)

☺The area of a convex mirror that is exposed to incident light is called the aperture. If the aperture of a convex mirror is small, then its focal length is equal to half its radius of curvature. The height of the spherical mirror is called it's aperture.

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