Question

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

Answer 1

a) Pole : The centre of the spherical mirror is called pole of the mirror.
b) Centre of curvature : The normal from a concave mirror converge at a point, that point is called centre of curvature.
c) Focus : The rays coming from distinct object parallel to concave mirror will converge at a point called focus or focal point.
d) Radius of curvature : The distance between vertex and centre of curvature is called radius of curvature.
e) Focal length : The distance between vertex and focus.
f) Principal axis : The horizontal line which passes through the centre of curvature.
g) Object distance : The distance between object and mirror is called object distance.
h) Image distance : The distance between image and mirror is called image distance.
i) Magnification : Ratio of size of image to size of object.