Question

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Define the six basic terms used in the study of spherical mirrors. Draw a diagram labelling them(optional).

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Answer 1

The 6 basic terms used in the study of spherical mirrors are

1•The pole of the mirror

2•It's centre of curvature

3•It's principal axis

4•It's principal focus or focus point

5•It's radius of curvature

6•It's focal length

Answer 2

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There are a few basic terminologies that one needs to know while studying spherical mirrors, and they are:

• Center of Curvature

The point in the centre of the mirror passes through the curve of the mirror and has the same tangent and curvature at that point.

• Radius of Curvature

It’s the linear distance between the pole and the centre of curvature.

• Principal Axis

The imaginary line passes through the optical centre and the centre of curvature of any lens or a spherical mirror.

• Pole

The midpoint of the spherical mirror.

• Aperture

An aperture of a mirror or lens is a point from which the reflection of light actually happens. It also gives the size of the mirror.

• Principal Focus

Principal Focus can also be called Focal Point. It’s on the axis of a mirror or lens wherein rays of light parallel to the axis converge or appear to converge after reflection or refraction.

• Focus

It’s any given point, where light rays parallel to the principal axis, will converge after getting reflected from the mirror.