Question

Why do prisms are used in binoculars

Answer 1

The prisms in a set of binoculars are vital for image correction and keeping the binoculars small enough to be hand-held. When light passes through the objective lens of a pair of binoculars, the image is inverted. For some viewing applications this wouldn’t be an issue but for many this is a problem. In order to rectify this, complex lens arrangements can be used to correct it. These can often make the instrument longer and trickier to handle. In binoculars prisms are used to make the correction. The prisms also serve to reduce the size of the binoculars. This is a result of their path bending qualities, as the light’s path curls through the prisms, the length of the instrument is reduced making it easier to handle.

Answer 2

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.