Image formation by convex mirror when object is at infinity

As we have learned how to draw a ray diagram of a concave mirror by using rules for making a ray diagram, we can also use these rules for a convex mirror.

Today we are going to learn image formation by convex mirror when the object is at infinity.

Image formation by convex mirror

 

Steps to draw to ray diagram

 

   1.   Draw the diagram of a convex mirror

   2.   Place the object at the given position

   3.   Follow the rules for making a ray diagram

Draw the diagram of a convex mirror

You must draw the following diagram in the beginning and after that place the object at /in the given position.

Place the object in the given position

 We have to place the object at infinity. In this condition, the sun or a star is at infinity from the concave mirror.

Follow the rules for making a ray diagram

All the light rays from the object at infinity come parallel to the principal axis and incident on the convex mirror.

These rays diverge on the reflection and appear to come from the focus point F behind the convex mirror.

The reflected rays do not meet but when we expand these rays behind the mirror, they seem to meet at the focus point.

So the image is formed at the Focus point.

Position of image	At Focus point (F) behind the mirror
Nature of image	Virtual and erect
Size of image	Highly diminished

Related Topics

Image formation by the concave mirror when -

1. Object beyond C

2. Object at C

3. Object at infinity

4. Object between C and F

5. Object between F and P