Ray diagram of convex lens when object is placed between 2F1 and F1

Today we are going to learn how to draw a ray diagram of a convex lens when the object is placed between `2F_1` and `F_1` and find the nature, position, and size of the image.

Steps of drawing a ray diagram of a convex lens

1. Draw the diagram of a 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 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  `2F_1`

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 cross or meet below the principal axis between `2F_2` and infinity or beyond `2F_2`

 

 

Position of image	Between `2F_2` and infinity
Nature of image	Real and inverted
Size of image	Enlarged

So after following the rules for making a ray diagram of a convex lens, we can easily make image formation by convex lens.

Related Topics

Image formation by a convex lens when 

1. Object is at Focus point (F1)

2. When an object beyond 2F1

3. Object  at infinity 

4. Object at 2F1

5. Object between F1 and O

6.  What is a refractive index