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