Question

Define the following:

a) pole b) centre of curvature c) radius of curvature d) principal focus e)  principal axis d)  focal length and e)   aperture of the concave mirror.​

Answer 1

Answer:

(a) Centre of curvature: Centre of curvature of a spherical mirror is the centre of the hollow sphere of glass of which the mirror is a part.

(b) Radius of curvature: Radius of curvature of a spherical mirror is the radius of the hollow sphere of glass of which the mirror is a part.

(c) Pole: The centre of a spherical mirror is called its pole.

(d) Principal axis: The straight line passing through the centre of curvature and pole of a spherical mirror is called its principal axis.

(e) Aperture: The portion of a mirror from which the reflection of light actually takes place is called the aperture of the mirror.

(f)Apertureof the concave mirror. The diameter of the reflecting surface of spherical mirror is called its aperture. Mirrors whose aperture is much smaller than its radius of curvature, we use R=2f

(g) principal of focus:The principal focus is defined as the point where a beam parallel to the principal axis appears to diverge converges from a point on the principal axis after passing through the lens.

(h)focul length:the distance between the centre of a mirror or a lens and its focus.

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