i) what do you mean by the equivalent lens? Derive an expression tor the equivalent focal length of system of two lenses placed at a certain - Sarthaks eConnect | Largest Online
Derive the expression for effective focal length of two thin lenses kept in contact. - Sarthaks eConnect | Largest Online Education Community
What do you mean by an equivalent lens? The system of two equivalent lenses are placed at a distance then derive the equation of equivalent focus and power.
![optics - How to determine the focal length of a lens that is equivalent to two lenses? - Physics Stack Exchange optics - How to determine the focal length of a lens that is equivalent to two lenses? - Physics Stack Exchange](https://i.stack.imgur.com/ft0ue.png)
optics - How to determine the focal length of a lens that is equivalent to two lenses? - Physics Stack Exchange
![Derivation of Equivalent Focal Length of Combination of two lens separated by distance #kamaldheerya - YouTube Derivation of Equivalent Focal Length of Combination of two lens separated by distance #kamaldheerya - YouTube](https://i.ytimg.com/vi/JTOSQLL93pY/maxresdefault.jpg)
Derivation of Equivalent Focal Length of Combination of two lens separated by distance #kamaldheerya - YouTube
![Oppo shows off its next-generation optical zoom camera module with 85-135mm equivalent focal length: Digital Photography Review Oppo shows off its next-generation optical zoom camera module with 85-135mm equivalent focal length: Digital Photography Review](https://www.dpreview.com/files/p/articles/7666573079/OPPO_announces_a_new_generation_of_hybrid_light_transformation_technology__step-by-step_zoom-drive_image_future__OPPO_China_-2020-08-19-12.52.53.jpeg)
Oppo shows off its next-generation optical zoom camera module with 85-135mm equivalent focal length: Digital Photography Review
![Physic 55.4: Optics- Multiple Lenses (4 of 12) The Triple Lens: The Equivalent Focal Length - YouTube Physic 55.4: Optics- Multiple Lenses (4 of 12) The Triple Lens: The Equivalent Focal Length - YouTube](https://i.ytimg.com/vi/w9tGbGVpM-8/hqdefault.jpg)