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# HW3 - length 6 cm 4 A lightbulb is placed at x = 0 cm on an...

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Phys 375 –Prof. Fuhrer Homework #3, due in class week of February 21-22, 2011 1) The normal human eye can focus on objects at distances ranging from 25 cm to infinity. The distance from lens to retina is about 1.7 cm. What is the range of focal lengths of the lens of the eye? Use a ruler and pencil and paper to find the image distances and magnifications for the following two situations. You must draw these by hand, and use the measured distances to find the image distances and magnifications! You may check your results with the thin-lens equation. 2) An object of height 2 cm at a distance 10 cm from a converging lens of focal length 6 cm. 3) An object of height 2 cm at a distance 10 cm from a diverging lens of focal
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Unformatted text preview: length 6 cm. 4) A lightbulb is placed at x = 0 cm on an optical bench. A diverging lens of unknown focal length is placed at x = 15 cm. A converging lens of focal length 10 cm is placed at x = 45 cm. A screen is placed at x = 60 cm and shows a well-focused image of the light bulb filament. A) What is the focal length of the diverging lens? B) What is the lateral magnification of the image? C) Is the image upright or inverted? 5) A converging lens is used to form an image at s ’ of an object at s . Suppose the object has finite thickness; i.e. it extends from s to s + ds . Show that the longitudinal magnification of the object ds ’/ ds = -M 2 , where M = -s ’/ s is the lateral magnification....
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