anonymous
  • anonymous
***PLEASE HELP! TEST TOMORROW!*** An object is placed 10.0 cm in front of a mirror. what type must the mirror be to form an image of the object that is 2.00 m away from the mirror? what is the magnification of the image?
Physics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
I got -5 as the magnification, and it also asked whether it was virtual or real, and upright or inverted. I said it virtual and upright.. Can anyone tell me if I am right?
LastDayWork
  • LastDayWork
What do you understand by "..away from the mirror.." ??
dumbcow
  • dumbcow
sorry i am not familiar with these type of problems

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anonymous
  • anonymous
Its okay @dumbcow
anonymous
  • anonymous
and what do you mean @LastDayWork
dumbcow
  • dumbcow
i did find this, it may help http://en.wikipedia.org/wiki/Magnification#Calculating_the_magnification_of_optical_systems
LastDayWork
  • LastDayWork
Away from the mirror can imply either side..real and virtual..
LastDayWork
  • LastDayWork
@Mashy Can you help here ??
anonymous
  • anonymous
Ok.. first u need to decide if its Convex mirror or Concave mirror.. (its not plain, cause in plain object distance = image distance) now can u first tell me is it convex or concave? (think properly.. u ll get it.. @LastDayWork.. i hope u know which one it is :P)
LastDayWork
  • LastDayWork
XD
anonymous
  • anonymous
its convex right?
anonymous
  • anonymous
why do u think its convex?
anonymous
  • anonymous
draw a general ray diagram for convex.. showing objects and images.. then u ll be able to uderstand..
anonymous
  • anonymous
but it doesnt give you enough information to decide which one it is?
anonymous
  • anonymous
the info is not needed.. only one of them is possible.. just draw a ray diagram.. i am telling.. that ll make u understand!
anonymous
  • anonymous
i drew it and still dont see how it isnt convex
anonymous
  • anonymous
oh wait! is it concave outside?
anonymous
  • anonymous
if u drew it properly.. which distance u see bigger? object distance or image distance ?
anonymous
  • anonymous
|dw:1392185681486:dw| this is kinda what the ray diagram is... see where the image is formed..
anonymous
  • anonymous
yeah...
anonymous
  • anonymous
so which distance is bigger in case of convex? object or image?
anonymous
  • anonymous
object
anonymous
  • anonymous
good.. so the image is ALWAYS.. ALWAYSSSS.. magnified or diminshed ?
anonymous
  • anonymous
diminished
anonymous
  • anonymous
so.. now u understand.. why in the rear view mirrors.. they say 'objects are closer than they appear" cause the images are always diminshed.. and we will THINK.. that they are far away.. cause our stupid brains say "hey that car looks small.. so it must be far" ok.. now.. we nailed it down.. that its concave.. right?.. but we are not done yet.. there are stil two possibilities! In concave..
anonymous
  • anonymous
yeah! would it be concave outside?
anonymous
  • anonymous
what u mean concave outside? o.O
anonymous
  • anonymous
there is only one type of concave :P
anonymous
  • anonymous
you said there are two possibilities
anonymous
  • anonymous
i meant.. in concave mirror itself.. there are two places u can keep the object.. such that u get image 2m away. can you think which are the two cases ?
anonymous
  • anonymous
in front of and behind
anonymous
  • anonymous
u can't be something BEHIND the mirror.. if u go BEHIND the mirror.. there is NO reflection darling!
anonymous
  • anonymous
like inside the focal point and behind the focal point
anonymous
  • anonymous
Ahaa.. yea.. thats the one so if the object is kept Between the mirror (pole) and the focal point.. will u get real or virtual image?
anonymous
  • anonymous
virtual
anonymous
  • anonymous
perfect.. will this be magnified or diminished ?
anonymous
  • anonymous
magnified
anonymous
  • anonymous
yuppeerrss so.. it could be this case.. so the image could be virtual.. and magnified.. so in this case the magnification is positive hence in this case... magnification = + 200/10 = 20 ( i wonder how u got 5 as the answer o.O) now is it possible to keep the object in such a way, that u get a real enlarged image?
anonymous
  • anonymous
so would it be the concave that is in front of the focal point just because we have to get a real image and not a virtual one?
anonymous
  • anonymous
and where did you get 200 from?
anonymous
  • anonymous
you mean "outside its focal point?" YES so in this case ALSO the given condition is satisfied hence.. in this case, the magification is negative magnification = image distance/ object distance ( i am not considering signs .. cause i dunno what sign convention u use.. don't wanna confuse u.. ) image distance = 2m = 200cm object distance = 10cm
anonymous
  • anonymous
so in the real case u would end up with Real image, and -20 as the magnification!
anonymous
  • anonymous
ohh! okay! thank you sooo muchh
anonymous
  • anonymous
no problem! :) :)!
anonymous
  • anonymous
:)

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