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![[Post New]](/templates/default/images/icon_minipost_new.gif) 22 May 2008 22:00:08 IST
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I think the answer d is right...
The principal axes of both the lenses won't coincide when you paint the middle portion black. Now this will be as if there are two lenses separated by a distance.. With the object for one lying below the principal axis and above for the other. So correspondingly two images are formed..
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22 May 2008 22:02:39 IST
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a)the upper half of the lens would form a image down side but not complete.
b)the lower half of the image would also form a image but above the principal axis.
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22 May 2008 22:09:51 IST
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NO.
As we have not displaced the 2 parts from their initial position, their respective optic axis wud remain same as the axis of the whole lens.
And as nothing is given abt the object, we wud consider it to be a point object. So we dont need to take into account that the image is formed above or below the axis.
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22 May 2008 23:00:52 IST
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ohhhh this is becoming confusing........
i wud request some expert to answer please.....
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FAILURE IS NOT FALLING IN LIFE BUT NOT RISING AGAIN AFTER FALLING!!!!!!
I LIKE WAVES NOT BECAUSE THEY RISE AND FALL..
BUT BECAUSE EVERYTIME THEY FALL THEY RISE AGAIN!!!!!!!
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22 May 2008 23:22:29 IST
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plzz experts clear the confusion...
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FAILURE IS NOT FALLING IN LIFE BUT NOT RISING AGAIN AFTER FALLING!!!!!!
I LIKE WAVES NOT BECAUSE THEY RISE AND FALL..
BUT BECAUSE EVERYTIME THEY FALL THEY RISE AGAIN!!!!!!!
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22 May 2008 23:40:49 IST
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oye yaar...........u are assured that the answer is c) iff and only iff the lens is just covered and not seperated...
so u cud have a check at the question another time if u want to.........ive seen many such Q.s yaar.........a similar or say the same Q. in fiitjee and the answer was c) only.......( i mean not c of those options but the answer that c means in ur list of options).......so jus. relax..........
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"Logic is the systematic way of reaching the wrong conclusion with confidence" lol..... |
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23 May 2008 00:42:45 IST
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Yaar, why are you getting confused??????
It is a very common question. One of my frnds just told me that this ques is given in BT's tests and the answer given there is C.
And I also found this question in DC Pandey Objective and there also the same answer is given.
So as far as answer is concerned, no need to panic abt it. IT is C.
And you are good enough to think abt the reason. Just read the reason posted by me and you will get it.
WHEN THE OPTICAL AXIS OF THE 2 PARTS IS COINCIDING, THEN EVEN IF THEY FORM DIFFERENT IMAGES, THE IMAGES WILL ALSO COINCIDE.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
http://tarinbansal.blogspot.com/
Posts:
Can marks really judge a student??
Some myths about Chemical Engineering.
(A must see for every student)
Back to goiit, this time with Baby Veerappan. :D |
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23 May 2008 10:28:32 IST
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EASY QUESTION
SINCE THE LENS IS PAINTED BLACK IN BETWEEN SO LESS INTENSITY OF LIGHT WILL PASS(REMEMBER
INTENSITY IS DIRECTLY PROPOTIONAL TO APERTURE HERE AFFECTIVE APERTURE HAS DECREASED DUE TO PAINTING) MOREOVER THE THE FOCUS OF THE TWO DIFFERENT PARTS COINCIDE SO
THE IMAGE(FORMED WHEN TWO RAYS MEET [REAL HERE])WILL BE DUE TO THE MEETING OF RAYS OF UPPER AND LOWER HALF!
I SUPPOSE U HAVE GOOD KNOWLEDGE OF MICROSCOPE N TELESCOPE N AFFECT OF LATERAL AND LONGITU. CUT IN LENSES
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23 May 2008 10:58:32 IST
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the answer will be d because after painting the lens black the lens will act as there are 2 individual lenses
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28 May 2008 14:48:01 IST
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it is d for sure there will b 2 images. d ques was in physics's pradeep class 12th... n yes rate me..
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28 May 2008 15:46:52 IST
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option c will b crrct whn it is painted half from upward or downward in dis case 2 images will b form.......
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28 May 2008 17:06:11 IST
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No matter what, you'll get just one image, dimmer than usual.
It wont act as two lenses because the two pieces lie one-above-the-other.For them to behave as independent leses, you need to have two different optic centres.
Half a convex lens doesnt converge light,right?
Its just that the few rays which passed through the optic centre will now be absent.
A similar thing is a worked example in NCERT class X textbook if I remember correctly...something to do with a zebra..
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28 May 2008 17:52:05 IST
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no ways........
painting a glass from d middle its lyk cutting it into 2 pieces.........
dats y 2 images will b formed...
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28 May 2008 17:59:57 IST
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@visa....see the figure given on page1....its just painted in the centre!!
What you are sayin will happen only if you BREAK the lens and SEPARATE the pieces!!
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28 May 2008 18:01:18 IST
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