why prisms are used in binoculars?
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A combination of two convex lenses is used in a simple binoculars with two small telescopes attached together. Each side is meant for an eye.
The quality of the images seen by the person is not very good, there are color aberrations and the image is inverted when lenses are used. If image is to be erected, one more lens is to be used and that makes the binoculars long. Also there is a loss of light energy when lenses are used.
Prisms are used to retain the total energy of light, as total internal reflection takes place. Prisms do not cause color aberration. The quality of the image is better and the image is erect.
The quality of the images seen by the person is not very good, there are color aberrations and the image is inverted when lenses are used. If image is to be erected, one more lens is to be used and that makes the binoculars long. Also there is a loss of light energy when lenses are used.
Prisms are used to retain the total energy of light, as total internal reflection takes place. Prisms do not cause color aberration. The quality of the image is better and the image is erect.
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Answer:
1. If 2 telescopes are mounted parallel to each other so that an object can be seen by both the eyes simultaneously the arrangement is called binocular.
2. The length of each tube is reduced by using a set of totally reflecting prisms.
3. They provide intense, erect image free from lateral inversion.
f0-focal length of objective
fe- focal length eyepiece
4. Through a binocular we get 2 images of the same object from different angles at same time.
5. Their super position gives the perception of depth also with length and breadth.
6. Binocular vision gives proper 3D image.
7. By using total reflecting prisms there is no loss of intensity.
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