anonymous
  • anonymous
The magnification of a magnifying lens of focal length 5 cm is :(final image is at infinity) a) 1 b) 2 c) 3 d) 5
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
wat si the type of lens that magnifies ur imge and also produces a virtual image? answer this question then wat is the ray diagram for getting image at infinity with that type of lens? wat is lens formula relating f,u,v i can get my v from that? wat is magnification? in terms of u and v u are near the answer once u have ansered all these questions
anonymous
  • anonymous
The lens must be a convex lens. The object is at focus.
anonymous
  • anonymous
\[1/v - 1/u = 1/f\]

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anonymous
  • anonymous
Here, v = 0
anonymous
  • anonymous
Also, m = v/u
anonymous
  • anonymous
But, I am not getting the answer.
anonymous
  • anonymous
put down the ray diagram for me when image is at infinity for convex lens
anonymous
  • anonymous
Just one minute. Here is the diagram.
anonymous
  • anonymous
|dw:1333555806014:dw|
anonymous
  • anonymous
@salini didi, Now say what to do.
anonymous
  • anonymous
yeah so? u=?
anonymous
  • anonymous
object disatnce=?
anonymous
  • anonymous
u = 5
anonymous
  • anonymous
then? tell me how do i proceed?
anonymous
  • anonymous
m = f/(f+u) = 5/(5+5) = 0.5?????
anonymous
  • anonymous
m=v/u u never used taht?
anonymous
  • anonymous
But how to do? Please say in detail the complete steps.
anonymous
  • anonymous
u know that formula?
anonymous
  • anonymous
U say akka. PLease.
anonymous
  • anonymous
i forgot for lenses tahts y ia m asking u
anonymous
  • anonymous
Ohhhhhhh!!! Can u please post the details tomorrow? I have to go now. Bye.
anonymous
  • anonymous
ok bye! see pg.182 of 10th ncert text book
anonymous
  • anonymous
Okay, will look and say tomorrow.
anonymous
  • anonymous
Its given that, m = v/u = h1 / h2
anonymous
  • anonymous
yeah so u know u, find V using lens formula then apply u/v to find magnification(the extent to which the image is magnified w.e.to object) the key here is taht u=focal length that u will come to know ONLY WHEN U DRAW THE RAY DIAGRAM!
anonymous
  • anonymous
But, v = 0 na?
anonymous
  • anonymous
1/f=1v-1/u 1/v=1/f+1/u by sign convention f=-5 u=-5
anonymous
  • anonymous
@salini didi, then, m = f/(f+u) = 5[5 + (-5)] = 5/0?????
anonymous
  • anonymous
v=?
anonymous
  • anonymous
v = 0, rite?
anonymous
  • anonymous
U learnt ssign convention?>
anonymous
  • anonymous
yeah. U try and see. This problem uses some different formula. Then only we can get it.
anonymous
  • anonymous
i will get back to you later after searching abt this problem
anonymous
  • anonymous
OK.
anonymous
  • anonymous
http://in.answers.yahoo.com/question/index;_ylt=AkFa8X1nxFG0SZ3pw3unEkYazKIX;_ylv=3?qid=20120406084524AArIAkz
anonymous
  • anonymous
http://in.answers.yahoo.com/question/index;_ylt=AkFa8X1nxFG0SZ3pw3unEkYazKIX;_ylv=3?qid=20120406084524AArIAkz
anonymous
  • anonymous
U r correct didi!!!!!! Cheers!!!!!!! thanks for the solution.
anonymous
  • anonymous
:) we learn nothing...........there is so much to learn further
anonymous
  • anonymous
Oooooooooo. But, it is a continous process. Being happy is also a continuous process. So, be happy!!!!!!:P
anonymous
  • anonymous
!!!!!!!!!!!!!!!!!! i dont know wat to type :)
anonymous
  • anonymous
Hehehehheheheheh!!!!!!!!!! Crazy Sister!!!!!!!!!!!!!
anonymous
  • anonymous
Can't stop laughing!!!!!!!!!!!!!!!!!!!!

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