Question

why r prisms used in binoculars

Answer 1

Prisms are used in binoculars because prisms suffer TIR(TOTAL INTERNAL REFLECTION) , which reflects 99% light falling on it , whereas a mirror reflects 94-95% light

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.