Question

define radius of curvature

Answer 1

radius of curvature is present in concave and convex .. lens and mirror respectively
it is nothing but the distance from pole(p) to the center of curvature(c)
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Answer 2

• The radius of curvature of a spherical mirror is the radius of the circle of which the spherical mirror is a part of it.

• It can also be defined as the distance between the centre of curvature of the mirror and the pole of the mirror on the optical axis.
• The radius of curvature is also the measure of how curved the mirror is.

• It is denoted as 'R'.
• The focal length of a spherical mirror is the distance between the pole of the mirror and the focus of the mirror on the optical axis.
• Rays parallel to the principal axis converge on the focus (for a concave mirror) or seem to diverge from the focus (for a convex mirror).
• Focal length is half of the radius of curvature for spherical mirrors and lenses.
• R = 2F
• F- Focal length.
• This property comes in very useful in many numerical problems.
• For a plane mirror, as the radius of curvature can be said to be infinity and hence, a plane mirror does not curve at all.
• The focus for a concave mirror is in front of the mirror (real focus) while for a convex mirror, it is behind the mirror (virtual focus) and hence, the corresponding focal lengths radii of curvatures of the two mirrors are measured in front and behind the mirrors respectively.

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