Derive the expression for effective focal length of two thin lenses kept in contact. - Sarthaks eConnect | Largest Online Education Community
![Consider two thin lenses, one of focal length f1 and the other of focal length f2, placed in contact with each other. Apply the thin lens equation to each of these lenses Consider two thin lenses, one of focal length f1 and the other of focal length f2, placed in contact with each other. Apply the thin lens equation to each of these lenses](https://homework.study.com/cimages/multimages/16/capture5473864438025005440.png)
Consider two thin lenses, one of focal length f1 and the other of focal length f2, placed in contact with each other. Apply the thin lens equation to each of these lenses
![Two thin convex lenses L1 and L2 of focal lengths f1 and f2 respectively, are placed coaxially in contact. An object is placed at a point beyond the focus of lens L1 . Two thin convex lenses L1 and L2 of focal lengths f1 and f2 respectively, are placed coaxially in contact. An object is placed at a point beyond the focus of lens L1 .](https://haygot.s3.amazonaws.com/questions/1683138_1785194_ans_7f84fa016e71411a8fde02410972563a.jpg)
Two thin convex lenses L1 and L2 of focal lengths f1 and f2 respectively, are placed coaxially in contact. An object is placed at a point beyond the focus of lens L1 .
![Physics 55.4 Optics- Multiple Lenses (3 of 12) The Double Lens: The Equivalent Focal Length - YouTube Physics 55.4 Optics- Multiple Lenses (3 of 12) The Double Lens: The Equivalent Focal Length - YouTube](https://i.ytimg.com/vi/GxemspUuOSU/sddefault.jpg)
Physics 55.4 Optics- Multiple Lenses (3 of 12) The Double Lens: The Equivalent Focal Length - YouTube
![Deduce the equivalent focal length of two convex lenses of focal lengthsf1andf2 when placed in contact Deduce the equivalent focal length of two convex lenses of focal lengthsf1andf2 when placed in contact](https://content-grail-production.s3.amazonaws.com/quetsion-media/e737a3d3-e547-4aab-9d2b-b28bb1a5bd63-image.png)
Deduce the equivalent focal length of two convex lenses of focal lengthsf1andf2 when placed in contact
![When two thin lenses are kept in contact prove that their combined or effective focal length F is given by 1F1F11F2 where the terms have their usual meaning When two thin lenses are kept in contact prove that their combined or effective focal length F is given by 1F1F11F2 where the terms have their usual meaning](https://content-grail-production.s3.amazonaws.com/quetsion-media/24066af9-5039-4636-b492-415c8f1e7ec2-image.png)
When two thin lenses are kept in contact prove that their combined or effective focal length F is given by 1F1F11F2 where the terms have their usual meaning
![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)
Physic 55.4: Optics- Multiple Lenses (4 of 12) The Triple Lens: The Equivalent Focal Length - YouTube
![Two thin convex lens L1 and L2 of focal lengths f1 and f2 respectively,are placed coaxially in contact An - Physics - Ray Optics And Optical Instruments - 10695119 | Meritnation.com Two thin convex lens L1 and L2 of focal lengths f1 and f2 respectively,are placed coaxially in contact An - Physics - Ray Optics And Optical Instruments - 10695119 | Meritnation.com](https://s3mn.mnimgs.com/img/shared/ck-files/ck_57f27e198e457.png)
Two thin convex lens L1 and L2 of focal lengths f1 and f2 respectively,are placed coaxially in contact An - Physics - Ray Optics And Optical Instruments - 10695119 | Meritnation.com
![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)