Ray diagram of convex lens when object is placed between F1 and optical centre (O)

Through the rules of the ray diagram, we can easily draw image formation by a convex lens when the object is placed between `F_1` and the optical centre.

Steps of drawing ray diagram of the convex lens

1. Draw the diagram of the convex lens

2. Place the object at 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 centre). 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

Now we place the object (up-arrow) between `F_1` and Optical centre (O)

Draw a ray diagram by following rules

We draw two light rays coming from point A (object) with the help of rules for making a ray diagram.

The first light ray parallel to the principal axis incident on the convex lens and passes through `F_2` after refraction.

The second light ray passes through the optical centre (O) and goes straight without refraction.

Both the rays do not cross or meet after refraction.

When we draw these rays backwards with a dotted line, they meet on the principal axis on the side of the object.

This is the only position of the object for which the image formed is virtual and erect.

 

Position of image	On the same side of the object
Nature of image	Virtual and erect
Size of image	Enlarged

Related Topics 

Image formation by convex lens

1. Object is at Focus point (F1)

2. When an object beyond 2F1

3. Object  at infinity 

4. Object between 2F1 and F1

5. Object at 2F1

6.  What is a refractive index