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Dera sir, please explain the displacement method to find the focal length of the convex lens in detail
Asked by modi72879 | 22 Feb, 2018, 10:03: PM
Let us fix the position of object and place the screen to get the enlarged image first. Also let us fix the position of screen where we get the enlarged image.
Let D be the distance bewteen object and screen. Let us mark the posistion of lens x1. Then let us move the lens away from the object to get a diminshed image. Let this position of lens be x2.  let X be the distance between the lens positions x1 and x2.
Let v be the distance between image and lens. Let u be the distanve between object and lens

Hence from the known values of D and x we can determine the focal length of convex lens
Answered by Thiyagarajan K | 23 Feb, 2018, 07:42: AM

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