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Lenses and Focusing

# Lenses and Focusing - Lenses and Focusing Class Physics 182...

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Lenses and Focusing Class: Physics 182 Lab Summer II TA: Joy Ding Date of Experiment: 7/30/10 Due Date: 8/2/10 Itzel Rodriguez

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Goal of Experiment: The purpose of this lab was to reveal the focal point of different optical instruments by using rulers and incident light. Also, this lab was used to figure out the image height, image distance, magnification, and focal length using ray tracing. Introduction : In order to produce an image, lenses are used to focus the rays and make an image appear. The focal point is where the incoming rays intersect. An image is blurry when the points do not intersect at one specific point. Where ever the focal point is created that is the distance from the lens where the image of the object can be seen clearly. Focal lengths can be both positive and negative. When a focal point is positive that means the image is real but when the focal point is negative that means the image is virtual. Focal length is better understood from the following equation = + 1f 1do 1di where d o is the distance from the object of the lens d i is the distance from the lens to the object. The lenses used also gives us some form of magnification and that relationship can be sen through the following equation =- M = dido hiho where h o is the height of the object and h i is the height of the image. It is important to know that there are two different kinds of lenses: convex and concave. A convex lens bows out and a concave lens bows in. A concave lens can only make a virtual image but a convex lens can make both and real and virtual images. A real image is when the image appears on the other side of the lens as the object. A virtual image pop up on the same side of the lens and object. Procedure:
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Lenses and Focusing - Lenses and Focusing Class Physics 182...

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