What do you know about the terms given below related to spherical mirrors?
a. Pole b. Centre of curvature c. Focus d. Radius of curvature e. Focal length
f. Principal axis g. Object distance h. Image distance i. Magnification
Answers
Centre of curvature : It is the center of the sphere of which the mirror is a part of.
Focus :When parallel rays from a far away source fall on the mirror they converge at(as in concave mirrors) or appear to come from a point(as in convex mirrors) called the focus.
Radius of curvature : It is the radius of the sphere of which the mirror is a part of.
Focal length : It is the distance between the focus and the pole of the mirror
Principal axis :It is an imaginary line passing through the center of curvature, the focus and the pole of the mirror
Object distance : It is the distance between the pole and the foot of the object placed on the principal axis
Image distance :It is the distance between the pole and the foot of the image formed on the principal axis
Magnification : It is ratio of the image distance and the object distance. It indicates the change in size after reflection
Heya..
Here is your answer...
a. pole: The point on the mirror at the middle of the surface is called its pole.
It is denoted by 'P'.
b.Centre of curvature: The centre of the sphere of which the mirror forms a part is called centre of curvature.
It is denoted by 'c'.
c. Focus: A point on the principal axis where a beam of light parallel to the principal axis either converges into or appears to diverge from after reflection from the mirror.
It is denoted by 'F'.
d. Radiusof curvature: The distance between pole and centre of curvature of the spherical mirror is known as radius of curvature.
It is denoted by 'R'.
e. Focal length: The distance of the focus from the pole is called focal length of the mirror.
It is denoted by 'f'.
f. Principal axis: The line joining the pole and the centre of curvature is called principal axis.
It is denoted by 'P'.
g. object distance: The distance of the object from the pole of a mirror is known as object distance.
It is denoted by 'u'.
h.Image distance: The distance of the image from the pole of a mirror is known as image distance.
It is denoted by 'v'.
i.Magnification: the ratio of size of image to the size of the object is known as magnification.
m = -v/u.
It may help you....☺☺