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 Problem 9: Go to the PhET website and run the geometrics optics simulation

http://phet.colorado.edu/sims/geometric-optics/geometric-optics_en.html


In the questions below, select all correct answers.

In this simulation you will explore converging lenses and how the distance of the object from the lens and the focal length determine the properties of the image formed by the lens.

Make sure "Marginal rays" is selected in the box at the top left of the screen.

The object is initially 2 f away from the lens. Move the object closer to the lens (but still further than f from the lens).

(15%) Problem 9: Go to the PhET website and run the geometrics optics simulation http://phet.colorado.edu/sims/geometric-optics/geometric-optics_en html In the questions below, select all correct answers In this simulation you will explore converging lenses and how the distance of the object from the lens and the focal length determine the properties of the image formed by the lens. Make sure Marginal rays is selected in the box at the top left of the screen. The object is initially 2faway from the lens. Move the object closer to the lens (but still further than ffrom the lens) </ 13% Part (a) What happens? The image gets bigger., The image moves further away from the lens. V Correct! 13% Part (b) What is the magnification of the image now? m is less than- Correct! ffrom the lens, what happens? 13% Part (c) Now move the obiect more than 2 The image shrinks., The image moves closer to the lens. / Correct! 13% Part (d) What is the magnification of the image now? m is betveen -1 and0 Correct! -X 13% Part (e) Now move the object so that it sits exactly at the focal length, what happens? The rays leaving the lens all come out parallel to each other., There is no image., The image gets bigger. X Incorrect! Feedback: is available 13% Part (f) Now move the obiect so that it sits inside the focal length of the lens. (Make sure that Virtual Images not yet selected.) What happens There is no image. V Correct!13% Part (g) Now select Virtual Image. What do you see? The image is larger than the object. Grade Summa Deductions 10% Potential ry The image is on the same side of the lens as the object. There is no image 90% Submissions Attempts remaining: 4 (10% per attempt) Nothing The image is closer to the lens than is the object. The rays leaving the lens all come out parallel to each other O The image is farther from the lens than is the object. O The image is smaller than the object detailed view 10% Submit Feedback Hints: for a 0% deduction. remaining: 0 Feedback: 5 % deduction per feedback. 囲/> 13% Part (h) This is what you see when you look through a magnifying glass-the virtual image. When you use a magnifying glass, where do you want the object!


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Answer #1

part (e) Ans.

when you put the object exactly at the focus. Rays will travel parallel to the principal axis and image will be formed at the Infinity, the image will be highly enlarged and will be real. (this is the assumption in physics that these parallel looking rays might converge at the infinity, forming an image out there.!)

Part (g) Ans.

  • Image is larger than the object.
  • Image is on the same side of the lens as the object.
  • Image is farther from the lens than the object.
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