LensExercises

# LensExercises - Exercises 1 Fray is holding up several...

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Exercises 1 . Fray is holding up several large pieces of curved pieces of glass in front of her. Determine the type of lenses (converging/diverging) these are, and what kind of Fray image (real/virtual) you are seeing through the glass. This is Fray with no lens in front of her. (a) (b) (c) 2 . Rank these lenses ((I)-(IV)) from shortest to longest focal point. Then rank these lenses from greatest to least optical strength. 3 . Kelly's eyeglasses have a focal length of +10cm and Fray's eyeglasses have a focal length of -5cm. Whose eyeglasses could start a fire by focusing the light from the Sun onto a piece of newspaper to ignite it—Fray’s or Kelly's? 4 . Lens Practice: i) Locate the each of the following objects with a ray tracing, ii) Locate each of the following objects with the thin lens equation, iii) Determine the magnification with your ray tracing, iv) Determine the magnification mathematically, v) Check that your answers match (if you didn’t already), vi) Check your work with the applet on the course web page. a) An object is placed 4 cm from an f =+10cm lens. b) An object is placed 8 cm from an f =+10cm lens. c) An object is placed 8cm from an f =-10cm lens. d) An object is placed 18 cm from an f =+10cm lens. e) An object is placed 18 cm from an f =-10cm lens. f) An object is placed 15cm from a converging lens that has a focal length of +7.5cm? 5

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LensExercises - Exercises 1 Fray is holding up several...

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