IRay Optics Change in Focal Length when we Cut the lens for IT-JEE and NEET Physics is the topic of this video lesson. We know that the focal length of a lens is the distance of optical center to the principal focus.It depends on the radius of curvature of lens and when we cut the lens, its radius of curvature gets effected and hence its focal length too effected. The intensity of the image also gets affected and we can measure and understand it as shown in the video lesson here. 0:00 wHAT IS FOCAL LENTH... 1:30 for a plano convex lens.. 4:30 when two lenses are separated by a distance.. 6:00 effective power.. IIT-JEE and NEET Physics is is a Complete Physics Resource for preparing IIT-JEE,NEET,CBSE,ICSE and IGCSE. All Physics topics are divided into multiple sub topics and are explained in detail using concept videos and synopsis.Lots of problems in each topic are solved to understand the concepts clearly. #jeephysics #neetphysics #rayoptics Yours Reliable Physics Learning Resource for Competitions can be found at http://www.venkatsacademy.com/