Optics Lab Report

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Laboratory report ascertaining the absolute Focal Length of a Convex Lens Aim: The intention of this Laboratory experiment is to determine, with safety and exactitude, the precise Focal Length of the given Convex Lens. By using the data recorded down with a vast number of analytical techniques in conjunction with the formula given for a thin lens ( 1f=1u+1 v ) Theory: By using the formula given for a thin lens and substituting my measurements into the formula the result should be an exact measurement of the focal length (10cm) or (20cm) depending on the convex lens provided for the experiment. However my hypothesis would show that the results recorded will be slightly fallacious, since the major difficulty is to judge at which screen position or lens position can form the sharpest image. I think a major source of error is the scientist in questions eyesight; one of the dependant variables. Subsequently the entire experiment would be completely dependable on what was seen as in focus and not in focus. Correspondingly the actual focal length of the lens itself cannot be changed, neither can the distance between the lens and projected image. However there are various independent variables in hand within this experiment, for example with measurement (u) we can only move the lens and not the object. So if we abide by the law of the formula that is given to us, measurement (v) will always equal up to the exact focal length first recorded down at the beginning of the initial laboratory experiment. Thus making distance (u) the independent variable. Apparatus needed: Lamp, Object, Convex Lens, Screen, 1m Ruler Procedure: * Acquire a Convex Lens and hold it slightly away from a natural light source eg, the window and project a picture of that light source onto the wall. * Now keep amending the Convex Lens back and forth until the picture

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