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![[Post New]](/templates/default/images/icon_minipost_new.gif) 6 Mar 2008 19:43:18 IST
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Calculate the distance d, so that a real image of an object at O, 15cm in front of a convex lens of focal length 10cm be formed at the same point O. The radius of curvature of the mirror is 20cm. Will the image be inverted or eract?
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Manjot Pahwa |
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6 Mar 2008 19:43:38 IST
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this is URGENT
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Manjot Pahwa |
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6 Mar 2008 19:46:00 IST
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HELP OUT GOT MA XAM 2MRW
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Manjot Pahwa |
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6 Mar 2008 21:09:16 IST
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see, using lens formula u will get v= +30cm. now, the image of lens will act as object for the mirror. to get the image back at O, the image should be formed at the centre of curvature.( 20cm from the mirror) so, d = 20cm + 30cm = 50cm.
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
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Goblet of Fire, Chapter 37, Page 724
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10 Mar 2008 20:19:40 IST
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i agree with ashgirl. In the setup she mentioned, the image will be real. However, another soln exists i.e. Image of lens at pole of mirror. This will give d = 30 cm and img will be inverted
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"A perfect mind is a treasure unsurpassed."
"It is said that human beings have 5 senses. That's because most of them lack the 6th - common sense."
-- astatine19 --
http://astatine19.blogspot.com/
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10 Mar 2008 20:20:15 IST
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i agree with ashgirl. In the setup she mentioned, the image will be erect. However, another soln exists i.e. Image of lens at pole of mirror. This will give d = 30 cm and img will be inverted
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"A perfect mind is a treasure unsurpassed."
"It is said that human beings have 5 senses. That's because most of them lack the 6th - common sense."
-- astatine19 --
http://astatine19.blogspot.com/
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11 Mar 2008 20:00:59 IST
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u = -15, f = 10 then v = 30 cm Distance from the lens to mirror d = R + v = 50 cm. The final image will be errect.
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11 Mar 2008 20:04:44 IST
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Please correct d = R + v = 20 = 30 = 50 cm, errect
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