Ray diagram of convex lens when object is at infinity

With the help of rules for making a ray diagram of a convex lens, we can draw image formation of an object placed at infinity from the convex lens.

Steps of drawing ray diagram of the convex lens

   1.   Draw the diagram of the convex lens

   2.   Place the object in the given position

   3.   Draw a ray diagram by following the rules

 

Draw the diagram of the convex lens

First of all, we will have to draw the diagram of a convex lens with a principal axis (a horizontal line passing through the optical center).

 Now mark `F_1` and `2F_1` on the left-hand side of the lens and `F_2` and  `2F_2` on the right-hand side of the lens.

 

Place the object in the given position

In this case, the object is at infinity, so we don’t have to draw the object.

 

Draw a ray diagram by following the rules

A ray diagram of the convex lens can be drawn by following the rules for making ray diagrams.

All the light rays coming from the object at infinity are parallel to the principal axis.

 

We will draw two parallel line incidents on the convex lens.

Both the rays pass through `F_2` or cross each other at `F_2` after refraction.

So the image is formed at `F_2`

 

Position of image	At `F_2`
Nature of image	Real and inverted
Size of image	Highly diminished

Image Formation by Convex lens when an object at infinity Video

Related Topics

Image formation by convex lens 

1. Object is at Focus point (F1)

2. When an object beyond 2F1

3. Object between 2F1 and F1

4. Object at 2F1

5. Object between F1 and O

6.  What is a refractive index