Question

Define:
1.Pole
2.Principal Axis
3.Principal Focus
4.Aperture
5.Centre of Curvature

$\bold{Chapter - 10 \\\ \textless \ br /\ \textgreater \ Light - Reflection and Refraction}$
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Answer 1

Answer:

1.a long, slender, rounded piece of wood or metal, typically used with one end placed in the ground as a support for something.

2.each of three mutually perpendicular axes in a body about which the moment of inertia is at a maximum.

3.1 (Also called) principal focus, focus the point on the axis of a lens or mirror to which parallel rays of light converge or from which they appear to diverge after refraction or reflection. 2 a central point of attention or interest.

4.an opening, hole, or gap.

5.the centre of a circle which passes through a curve at a given point and has the same tangent and curvature at that point.

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Answer 2

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POLE:-

Pole of the spherical mirror is the mid -point of its reflecting surface is called pole.

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PRINCIPAL AXIS:-

The principal axis of a spherical mirror is the line joining the pole and centre of curvature is called principal axis.

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PRINCIPAL FOCUS:-

It is a point on the principal axis of the mirror at which light rays coming parallel to principal axis is called principal focus.

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APERTURE:-

The diameter of the reflecting surfaces of a spherical mirror is called aperture.

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CENTRE OF CURVATURE:-

Centre of curvature of a spherical mirror is the centre of the imaginary sphere of which the mirror is a part is called centre of curvature.

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