We know that concave mirrors and convex mirrors are spherical mirrors. We will learn the rules for making a ray diagram by concave mirror. These rules are also applicable to convex mirrors.
When an object is placed before a spherical mirror –
concave or convex, a number of rays of light come towards the mirror.
To draw the image, we use those rays whose
path is certain.
1. A
ray parallel to the principal axis passes through the Focus point (F) after
reflection in the case of a concave mirror and appears to diverge from the focus point
in the case of a convex mirror.
2. A
ray passing through the focus point (F) of the concave mirror becomes parallel to
the principal axis and a ray coming towards the focus point (F) of the convex mirror
becomes parallel to the principal axis.
3. A ray passing through the center of curvature (C )of the concave mirror and directed towards the center of curvature of the convex mirror is reflected back to the same path.
4. A
ray of light coming obliquely towards pole (P) of a concave or convex mirror
reflects obliquely at the same angle in a different direction.
When we place objects at different places before a concave or convex mirror, we should use these rules for making a ray diagram.
These given rules are used as rules of image formation
by a convex mirror, so if you want to draw a ray diagram of image formation by a convex mirror then you can follow the above rules.
You can watch the video to understand this topic
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