We have discussed 5 positions of image formation by a concave mirror. We are going to learn how to draw a ray diagram of a concave mirror object between F and P.
This position before the concave mirror is very important.
Image formation by concave mirror
Steps to draw to ray diagram
1. Draw the diagram of a concave mirror
2. Place the object at the given position
3. Follow the rules for making a ray diagram
Draw the diagram of concave mirror
Place the object at the given position
Now we place
the object (↑) between focus point F and pole (P)
Rules for making ray diagram
A light ray from point ‘A’ of the object incident
parallel to the principal axis on the concave mirror.
The second light ray from the same point (A) incidents
on the mirror at certain angle at pole (P).
The parallel incident ray passes through the focus
point (F) after reflection.
The second incident ray gets reflected at the same angle as of angle of incidence (here `\anglei=\angler`)
Both the reflected rays never meet with each other but
when we extend the rays behind the mirror, they appear to meet on the principal
axis.
The image formed is virtual and erect.
|
Position of
image |
Behind the mirror |
|
Nature of image |
Virtual and
erect |
|
Size of image |
Enlarged |
For the object between F and P, watch the video from 15.15 min
.webp)
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