Engineering Physics I - Reflection of light by spherical mirror
Reflection of
light by spherical mirror
Curved or
spherical mirror:
Concave and
convex mirror are the examples of curved mirror.
Concave mirror:
It is a part of
spherical glass whose outer side is polished and inner side is reflecting.
Convex mirror:
It is a part of
spherical glass whose inner side is polished and outer side is reflecting.
Pole of the
mirror:
The midpoint ‘P’
of the mirror is called pole of the mirror.
Center of curvature:
The center of
the sphere of which the mirror is a part is known as center of curvature ‘C’.
Aperture:
Length of mirror
is known as aperture.
Principal axis:
A straight line
passing through the center of curvature and pole of the mirror is called
principal axis.
Principal focus
(F):
When a narrow
parallel beam of rays incident on the surface of concave or convex mirror, all
the reflected rays converge or appear to diverge to or from a fixed point of
the principal axis. The fixed point is known as principal focus of these
mirrors.
Focal length (f)
:
The distance
between pole of mirror ‘P’ and principal focus ‘F’ is called focal length (f)
of the mirror.
Radius of
curvature (R) :
The distance
between the pole of mirror ‘P’ and the center of curvature ‘C’ is called radius
of curvature(R).
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