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Old Jul 20th 2010, 07:15 PM   #1
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Converging Lens Related Question

An object is located 30 cm to the left of a converging lens whose focal length is 50 cm. (a) Draw a ray diagram to scale and from it determine the image distance and the magnification. (b) Use the thin lens and magnification equations to verify your answer to part (a).

I can't really draw it.. here's my attempt. (Rough sketch)


How do I determine the image distance?
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Old Jul 20th 2010, 09:41 PM   #2
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After refraction from the lens, two rays are diverging. Find the point from which the two rays are diverging by tracing the rays towards left. That point is the position of the image.
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Old Jul 21st 2010, 01:51 PM   #3
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Originally Posted by sa-ri-ga-ma View Post
After refraction from the lens, two rays are diverging. Find the point from which the two rays are diverging by tracing the rays towards left. That point is the position of the image.
Not sure what you mean by tracing the rays left.
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Old Jul 21st 2010, 08:15 PM   #4
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Originally Posted by Kookehs View Post
Not sure what you mean by tracing the rays left.
From a point source you can have two diverging rays.

Two diverging rays are coming out of the lens after refraction. Find the point from which they appear to be coming from. Produce these two rays in the reverse direction to find that point.
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Old Oct 12th 2010, 07:02 PM   #5
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Originally Posted by sa-ri-ga-ma View Post
From a point source you can have two diverging rays.

Two diverging rays are coming out of the lens after refraction. Find the point from which they appear to be coming from. Produce these two rays in the reverse direction to find that point.
I suggest to use a graph paper and use a proper scale to draw the rays where they meet.
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Old Oct 13th 2010, 08:30 AM   #6
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What sa-ri-ga-ma is telling you is to extend the lines backwards like this:



Where they meet, you drop a vertical line to the focal axis and draw the image.
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