When drawing ray diagrams the following symbols are used to represent the mirrors.
The image is located by drawing any two of the following rays:
i) A ray parallel to the principal axis which is reflected through the principal focus.
ii) A ray through the centre of curvature which is reflected along its own path since it hits the mirror normally.
iii) A ray through the principal focus which is reflected parallel to the principal axis.
Virtual images are formed when rays diverge and as such the rays are extended backwards using dotted line till they meet. The image formed is also dotted since it is not formed by an intersection of real rays. A real image is formed by intersection of real rays.
a) Object at infinity: image is formed at F. It is real, inverted and diminished.
b) Object at C : image formed at C . It is real, inverted and the same size as the object.
c) Object behind C: image is formed between C and F. It is real, inverted and diminished.
d) Object between F and C: Image is formed behind C. It is real, inverted and magnified.
e) Object at F: Image formed is at infinity
f) Object between F and P: Image is formed behind the mirror. It is virtual, erect and magnified.
Convex mirror.
g) Image is always formed behind the mirror. It is virtual, erect and always diminished.
Mutiso answered the question on
October 12, 2018 at 07:12