Optics question -- Object and Image on the optical axis....

Thread starter Zubair Ahmad
Start date Aug 22, 2018
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Axis Image Optical Optics

In summary, objects and images on the optical axis refer to the placement of an object and its corresponding image in relation to the imaginary line that runs through the center of a lens or mirror. The position of an object affects the position of its image on the optical axis, with closer objects forming images further away and vice versa. An object and its image cannot be located at the same position on the optical axis, and the size of an object is inversely proportional to the size of its image. Additionally, an object and its image can have different orientations on the optical axis as long as the light rays are not parallel to it.

Aug 22, 2018

Zubair Ahmad

Is it necessary that the image of the point object placed on the axis of optical system has its image formed on the axis?
Consider paraxial approximation.

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Aug 23, 2018

BvU

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Homework Helper

1. What is the difference between an object and an image on the optical axis?

Objects and images on the optical axis refer to the placement of an object and its corresponding image in relation to the optical axis of a lens or mirror. The optical axis is an imaginary line that runs through the center of the lens or mirror. An object is placed in front of the lens or mirror, while its image is formed behind the lens or mirror. The distance between the object and the lens or mirror is known as the object distance, while the distance between the image and the lens or mirror is known as the image distance.

2. How does the position of an object affect the position of its image on the optical axis?

The position of an object directly affects the position of its image on the optical axis. When an object is placed closer to the lens or mirror, its image will be formed further away from the lens or mirror. Conversely, when an object is placed further away from the lens or mirror, its image will be formed closer to the lens or mirror.

3. Can an object and its image be located at the same position on the optical axis?

No, an object and its image cannot be located at the same position on the optical axis. This is because an image is formed by rays of light that are refracted or reflected by the lens or mirror. These rays of light converge at a specific point to form the image, and this point cannot coincide with the position of the object.

4. How is the size of an object related to the size of its image on the optical axis?

The size of an object is inversely proportional to the size of its image on the optical axis. This means that when the size of the object increases, the size of its image decreases, and vice versa. This relationship is known as the magnification equation and is given by M = -i/o, where M is the magnification, i is the image distance, and o is the object distance.

5. Can an object and its image have different orientations on the optical axis?

Yes, an object and its image can have different orientations on the optical axis. This is because the orientation of an object is determined by the direction of the light rays that are emitted from it, while the orientation of an image is determined by the direction of the light rays that are refracted or reflected to form the image. As long as the light rays are not parallel to the optical axis, the object and its image can have different orientations.