![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
![How to measure the "equivalent focal length" of a (complex) telescope - ATM, Optics and DIY Forum - Cloudy Nights How to measure the "equivalent focal length" of a (complex) telescope - ATM, Optics and DIY Forum - Cloudy Nights](https://www.cloudynights.com/uploads/monthly_02_2017/post-79067-0-46732900-1486976067.png)
How to measure the "equivalent focal length" of a (complex) telescope - ATM, Optics and DIY Forum - Cloudy Nights
![6. Define focal length of a lens. Derive the expression equivalent focal length of combination of two thin convex lenses in contact. (U) 7. Which phenomenon is responsible the formation of rainbow? 6. Define focal length of a lens. Derive the expression equivalent focal length of combination of two thin convex lenses in contact. (U) 7. Which phenomenon is responsible the formation of rainbow?](https://toppr-doubts-media.s3.amazonaws.com/images/8378448/62f7a409-d2fd-4a84-9a9e-ad660e282af4.jpg)
6. Define focal length of a lens. Derive the expression equivalent focal length of combination of two thin convex lenses in contact. (U) 7. Which phenomenon is responsible the formation of rainbow?
![For the lens arrangement shown below, the focal length of equivalent system is in the form of 50x13 . Find the value of x.[Radii of curvature, focal lengths and refractive indices are For the lens arrangement shown below, the focal length of equivalent system is in the form of 50x13 . Find the value of x.[Radii of curvature, focal lengths and refractive indices are](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1094588/original_16.png)
For the lens arrangement shown below, the focal length of equivalent system is in the form of 50x13 . Find the value of x.[Radii of curvature, focal lengths and refractive indices are
Derivation of Equivalent Focal Length of two lens in contact optics @Kamaldheeriya Maths easy #education #learning #educator #studygram | In this video learn Derivation of Equivalent Focal Length of Combination of two
![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
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.
![Table of Equivalent Focal Lengths for APS-C sensor: Beginners Questions Forum: Digital Photography Review Table of Equivalent Focal Lengths for APS-C sensor: Beginners Questions Forum: Digital Photography Review](https://3.img-dpreview.com/files/g/TS560x560~2182310.jpg)