![A light ray MN becomes parallel to the principal axis after passing through a concave lens. The distance OA is theof the lens. A light ray MN becomes parallel to the principal axis after passing through a concave lens. The distance OA is theof the lens.](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1541977/original_14_%281%29-01.png)
A light ray MN becomes parallel to the principal axis after passing through a concave lens. The distance OA is theof the lens.
![a) An off-axis point source one focal length away from a lens produces... | Download Scientific Diagram a) An off-axis point source one focal length away from a lens produces... | Download Scientific Diagram](https://www.researchgate.net/publication/300379247/figure/fig1/AS:526324034355200@1502496836386/a-An-off-axis-point-source-one-focal-length-away-from-a-lens-produces-plane-waves-that.png)
a) An off-axis point source one focal length away from a lens produces... | Download Scientific Diagram
![What happens to a light ray traveling parallel to the optical axis of a convex lens that passes through the lens? | Socratic What happens to a light ray traveling parallel to the optical axis of a convex lens that passes through the lens? | Socratic](https://useruploads.socratic.org/Cu8f261kRieNEUmZfAFQ_lens-and-optical-axis.png)
What happens to a light ray traveling parallel to the optical axis of a convex lens that passes through the lens? | Socratic
![optics - How to find the principal axis of the pieces of lens after billetsplit cutting? - Physics Stack Exchange optics - How to find the principal axis of the pieces of lens after billetsplit cutting? - Physics Stack Exchange](https://i.stack.imgur.com/znVFr.jpg)