![Concave and convex lenses, each has the same focal length \\[20\\text{ cm}\\] and they are put in contact to form a combination lens. This combination lens is used to view an object Concave and convex lenses, each has the same focal length \\[20\\text{ cm}\\] and they are put in contact to form a combination lens. This combination lens is used to view an object](https://www.vedantu.com/question-sets/fefc0fc6-7ab4-417b-80e6-3b03115e40ae7759432403841777576.png)
Concave and convex lenses, each has the same focal length \\[20\\text{ cm}\\] and they are put in contact to form a combination lens. This combination lens is used to view an object
![Convex and concave lens. Optics physics icon. Scheme with light ray direction and bending through lens. Vector 4932234 Vector Art at Vecteezy Convex and concave lens. Optics physics icon. Scheme with light ray direction and bending through lens. Vector 4932234 Vector Art at Vecteezy](https://static.vecteezy.com/system/resources/previews/004/932/234/original/convex-and-concave-lens-optics-physics-icon-scheme-with-light-ray-direction-and-bending-through-lens-vector.jpg)
Convex and concave lens. Optics physics icon. Scheme with light ray direction and bending through lens. Vector 4932234 Vector Art at Vecteezy
![A convex lens of focal length F is placed in contact with a concave lens of focal length F . The equivalent focal length of the combination is: A convex lens of focal length F is placed in contact with a concave lens of focal length F . The equivalent focal length of the combination is:](https://dwes9vv9u0550.cloudfront.net/images/4385577/16e14b3f-95f1-4be0-aabe-d3e595a44425.jpg)