Ray diagram of convex lens when object between infinity and 2F1 (beyond 2F1)

We are going to draw a convex lens ray diagram when the object is placed between infinity and `2F_1`.

Through this convex lens ray diagram, we can easily 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)  beyond `2F_1`

 

Draw a ray diagram by following the rules

We draw two light rays coming from point A 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 `F_2` and `2F_2`.

 

 

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

Related Topics

Image formation by a convex lens when 

1. When an object at infinity

2. Object is at Focus point (F1)

3. Object between 2F1 and F1

4. Object at 2F1

5. Object between F1 and O

6.  What is a refractive index