Skip to main content
Login to unlock Email share
The larger objective lens captures light from a distance and magnifies it
image from http://www.explainthatstuff.com/binoculars.html
The smaller ocular/eyepiece lens magnifies the image further and transforms it into a visible picture for the eye.
- This means that the glass bends the light by slowing it down
Light passes through 2 prisms which rotates the image to make it right side up
- Prisms use internal reflection to bring beams of light closer to each other, and correct its orientation
image from http://www.yesmag.ca/Questions/binoculars.html
Binoculars are best thought of as 2 telescopes side by side...
- smaller prisms placed side by side
- beam of light is divided into 2 and placed back together again
- larger prims placed at a double-z shape
- prism lines up with eyepiece lens
- Wider view and better light collection
image from http://www.warehouseexpress.com/webcontent/images/guides/Binocu-huh/porro-roof.gif
Binoculars contain 4 lenses (2 objective, 2 ocular) and 2 prisms.
Types of Prisms