Question

Define the following terms for a concave mirror :
(i) Centre of curvature, (ii) principal axis, (iii) principal focus

Answer 1

Answer:

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Explanation:

(i) The centre of curvature of a concave mirror is the centre of the spherical mirror of which the mirror is a part.

(ii) The principal axis is an imaginary line which passes through the pole of the concave mirror.

(iii) The principal focus of a concave mirror is the point on the principal axis from where the light rays which are paralle to the principal axis will converge or diverge after reflection.

Answer 2

Explanation:

1. Center 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

2.Principal axis:- For a spherical mirror (globe) the principal axis is the line joining the pole of the mirror to the center of curvature. Precisely, one of the three mutually perpendicular axis of a body about which the moment of inertia is maximum or minimum.

3.Principal focus:-  a focus, also called an image point, is the point where light rays originating from a point on the object converge. Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle

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