Review of optics needed for Physics 113

Review of optics needed for Physics 113 - 1 (Diopters)...

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Review of optics needed for Physics 113 1. Lens Equation : 1 1 1 o i f d d = + Know the sign conventions. We will almost always work from left to right. The left side of the lens is the “object” side. Objects on the left side have positive o d . “Objects” on the right hand side (only possible for multiple lens problems) have negative o d . The right side of the lens is the “image” side. Images formed on the right side have positive i d . Those formed on the left side have negative i d . 2. Equation for magnification: i i o o h d m h d = - 3. Ray tracing fact: a ray that goes through the center of a lens passes through undeflected --- straight through. You should be able to use this fact to immediately derive the equation in “2.” (this is the only ray tracing fact we’ll use much in Physics 113). 4. Definition of the power of a lens:
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Unformatted text preview: 1 (Diopters) (meters) P f = You MUST express the focal length in meters when calculating the power. 5. Fact about lenses: when you look into a lens, your eye sees the IMAGE created by the lens. NOT the original object. Also you should understand the difference between a real and a virtual image. Basically, when a lens forms a real image, the rays coming from the lens converge to make a real picture of the object in front of the lens that will show up on a card or a screen held at the location of the image. When a lens forms a virtual image, the rays coming from the lens APPEAR to be coming from a picture of the object behind the lens. A screen or card held at that location would show nothing especially interesting....
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