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Lenses 2: Thin Lens Equation

Lenses 2: Thin Lens Equation. Lesson 10 November 24 th , 2010. Thin Lens Equation.

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Lenses 2: Thin Lens Equation

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  1. Lenses 2: Thin Lens Equation Lesson 10 November 24th, 2010

  2. Thin Lens Equation • The distance of the object from the lens, do, the distance of the image from the lens, di, and the focal length of a lens,f , can all be related using the thin lens equation. Given any two of these quantities, you can use the thin lens equation to solve for the third: 1=1+1 ƒdo di

  3. Thin Lens Equation • Keep in mind the following points when working with the thin lens equation • A concave lens has a negative focal length and a negative distance to the image. • A convex lens has a positive focal length and either a positive or negative distance to the image, depending where the object is placed. • The image distance di is positive if the image is real and negative if the image is virtual.

  4. Example Problem 1 • A convex lens of a magnifying glass is held 2.00 cm above a page to magnify the print. If the image produced by the lens is 3.60 cm away and virtual, what is the focal length of the magnifying glass?

  5. Example Problem 2 • A convex lens has a focal length of 60.0 cm. A candle is placed 50 cm from the lens. What type of image is formed, and how far is the image from the lens?

  6. Example Problem 3 • A camera with a 200-mm lens makes a real image of a bird on film. The film is located 201 mm behind the lens. Determine the distance from the lens to the bird.

  7. Focal Length: Lab • Purpose • To find a good approximation of the focal length of any convex lens and see the relationship between the curvature of the lens and the focal length

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