^Displacement method December 30, 2021/in Back end /by kp-web-admin^Displacement method This method is used in the labs to find the focal length of a convex lens. Consider an object placed between a thin convex lens of focal length ‘f’ & a screen at a distance ‘D’ from the screen. Using Lens formula for this problem one can write: To get two distinct images the discriminate > 0. Thus the essential condition to get two distinct real images on the screen is D > 4 f. From eqn. (1) the two roots of the quadratic i.e. two different distance of the lens from the object are given by: From these relations the distance between the two positions of the lens (say ‘x’) can be written as: The image distance can be written as: This implies that for the two positions of the lens the image & object distances are interchangeable. The magnification of the two images can be given by: Rate this post /wp-content/uploads/2021/04/logo-2.png 0 0 kp-web-admin /wp-content/uploads/2021/04/logo-2.png kp-web-admin2021-12-30 19:22:462021-12-30 19:29:20^Displacement method

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