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![[Post New]](/templates/default/images/icon_minipost_new.gif) 2 Jun 2007 14:43:14 IST
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the sun(diameter d) subtends an angle R radian at the pole of a concave mirror of focal length f .the diameter of the image of sun formed by mirror is what?????????????????????? Please reply me. Thank you in advance. you can SMS on me on 9421653669.
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2 Jun 2007 18:31:25 IST
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Let the radius of sun be r=d/2
Then, r/u=A [Where A is in Radian]
u=r/A
The distance of sun from earth can be cosidered infinity.
v=f
m=v/u=fA/r
m=2fA/d
Diameter of the image willl be:
x=v/u * 2r
=2fA [Ans.]
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.. What we want are Western science coupled with Vedanta, Brahmacharya as the guiding motto and Shraddhâ and also faith in oneself.
Swami Vivekananda |
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2 Jun 2007 18:52:24 IST
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It would be 2 f R .
By the way ,don't forget to rate me haaris.
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Ken
From: UNITED STATES, Green Bay, Wisconsin
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2 Jun 2007 18:58:21 IST
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Please explain...
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.. What we want are Western science coupled with Vedanta, Brahmacharya as the guiding motto and Shraddhâ and also faith in oneself.
Swami Vivekananda |
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4 Jun 2007 00:13:38 IST
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Yes please explain !
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THE RATED - R SUPERSTAR
The Ultimate Opurtunist |
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4 Jun 2007 13:29:45 IST
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u= infinity so v focus but paraxial rays r hitting pole so it means focus n pole of mirror coincides so a very diminished image is formed -v/u = 0 = magnification in diameter reply soon if im correct & rate me
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4 Jun 2007 13:37:09 IST
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Bad job dude ! By the way I am the Rated R Superstar ........
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THE RATED - R SUPERSTAR
The Ultimate Opurtunist |
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8 Jun 2007 16:31:17 IST
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Magnification, m = v/u
The rays are coming from very far so image formed is at f, v=f.
tanR = (d/2) / u
Since R is small tanR can be approximated to R.
R = (d/2) / u
u = d/2R
So, m = v/u = f / (d/2R)
m = 2fR/d
Hence diameter of image formed = md = 2fR
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Bipin Kumar Dubey
Chemical Dept.
IIT Kharagpur
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