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Key points in images, mirrors :
A real image can be projected.
A virtual image is when the rays are diverging such as a reflection in a mirror. Looking through a
magnifying glass also produces a virtual image, the image appears bigger and further away than it
Angle of INCIDENCE = angle of REFLECTION
These two angles are always defined between the ray itself and the NORMAL. The normal is
perpendicular to the mirror.
The image is the same size as the object, the same distance from the mirror, it is formed from
diverging rays this means that it is a virtual image. Below is an example:
Light shining on a concave mirror converges Concave mirrors are like a portion of a sphere, the
centre of the `would have been sphere' is known as the centre of curvature (C) and the centre of
the mirror is the vertex. If you draw a line between the two the middle point is the focal point(F).
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For a concave mirror the incident ray is parallel to the axis. Upon reflection it will pass through the
focal point (as above).
The distance from the mirror affects the image:
Object at C = real, upside down image, same size, same place.
Object between C and F = real, upside down bigger image, behind it.
Object in front of F = virtual, right way up, behind the mirror.
AN EXAMPLE OF WHEN A CONCAVE MIRROR IS USED IS FOR CAR WING MIRRORS.…read more