What would be the position of image formed by convex lens when the object is placed at infinity?

There are six possibilities of position of object in the case of convex lens:

Object at infinity:

Convex lens converge parallel rays coming from objet at infinity and a highly diminished - point sized, real and inverted image is formed at principal focus F2.

Fig: Object at Infinity

Properties of Image: Image is highly diminished, real and inverted.

Object beyond C1 or 2F1Centre of Curvature

A diminished, real and inverted image is formed between principal focus, F2 and centre of curvature, C2 at the opposite side when an object is placed beyond C1 of a convex lens.

Fig: Object Beyond 2F

Properties of Image: Image is diminished, real and inverted.

Object at CCentre of Curvature

A same sized, real and inverted image is formed at centre of curvature, C2 when object is placed at centre of curvature, C1 of a convex lens.

Fig: Object at 2F

Properties of Image: Image is same size as object, real and inverted.

Object between C and F

An enlarged, real and inverted image is formed beyond centre of curvature, C2 when an object is placed between centre of curvature, C1 and principal focus, F1 of a convex lens.

Fig: Object between 2F and F

Properties of Image: Image is enlarged, real and inverted.

Object at Focus F1

An infinitely large, real and inverted image is formed at infinity when object is placed at principal focus, F1 of a convex lens.

Fig: Object at F

Properties of Image: Image is highly enlarged, real and inverted.

Between F1 and O

A virtual, erect and enlarged image is formed at the same side of lens, when an object is placed between principal focus, F1 and optical centre, O of a convex lens.

Fig: Object between F and O

Properties of Image: Image is enlarged, virtual and erect.

Summary of Image Formation

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10 Questions 10 Marks 10 Mins

The correct answer is option 4 i.e At the focal point

• If an object is at infinity,  the position of an image formed due to the convex lens is at the focal point.
• Convex lens converge parallel rays coming from object at infinity and a highly diminished - point sized, real and inverted image is formed at principal focus.

​Properties of the image formed

• The image formed is highly diminished, real and inverted.

There are two types of lenses - ​

• Convex Lens: This type of lens is also known as Converging lens as when light passes through it converges at one point. 
• Concave Lens: This type of lens is also known as Diverging lens as all the rays diverged when light passes through it. 

Let's discuss the concepts related to Optics and Mirrors and Images. Explore more from Physics here. Learn now!

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