PLANE MIRROR
We are able to see because light from an object can move through space
and reach our eyes.
THE LAWS OF REFLECTION
1.
The incident ray, the reflected ray and the normal all
lie in the same plane.
2.
The angle of incidence, i is equal to the angle of
reflection, r.
RAY DIAGRAM OF THE IMAGE FORMED BY A PLANE
MIRROR
THE CHARACTERISTICS OF
THE IMAGE FORMED BY A PLANE MIRROR:
1.
laterally inverted
2.
same size as the object
3.
virtual
4.
as far behind the mirror as the object as the object
is in front of it
CURVED MIRROR
1.
The centre of curvature, C of curved mirror is the
centre of sphere of the mirror.
2.
The radius of curvature, R is the distance between the
centre of curvature, C and the surface of the mirror.
3.
The principal axis is the connecting line from the
centre of curvature to point P.
4.
The focal point, F is the point on principal axis
where parallel rays that strike the surface of a convex mirror will be
reflected and the diverging rays appear to come from a point inside the concave
mirror.
5.
The focal length, f is the distance between the centre
of curvature, C and the focal point, F. (CF = FP)
RAY DIAGRAM OF THE IMAGE FORMED BY A CONCAVE
MIRROR
RAY DIAGRAM OF THE IMAGE FORMED BY A CONVEX
MIRROR
APPLICATIONS OF PLANE MIRROR
MIRROR IN A METER
The
correct reading can only be taken when the image of pointer is exactly under
the pointer.
SIMPLE PERISCOPE
§ A simple
periscope consists of two plane mirrors inclined at an angle of 45o.
§ A periscope
can be used to see over the top of high obstacles such as a wall.
§ It is also
used inside a submarine to observe the surrounding above water surface.
OHP (OVERHEAD PROJECTOR)
OHP uses plane mirror to reflect the image to the screen.
APPLICATIONS OF CONCAVE MIRROR
TORCHES & CAR HEADLAMP
A small lamp is placed at the focus point of the mirror to produce
parallel rays.
APPLICATIONS OF CONVEX MIRROR
SECURITY MIRROR
A security mirror made from a convex mirror helps to widen field of
vision for security purposes.
Very nice job!
ReplyDeleteA couple of questions on the OHP scheme: What is the purpose of using a "focus lense"? Why do the lines meet/cross each other after the "plane mirror"?
Thank you!
Constantine
Athens, Greece