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natasha.aries

  • one year ago

***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?

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  1. natasha.aries
    • one year ago
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    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?

  2. LastDayWork
    • one year ago
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    What do you understand by "..away from the mirror.." ??

  3. dumbcow
    • one year ago
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    sorry i am not familiar with these type of problems

  4. natasha.aries
    • one year ago
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    Its okay @dumbcow

  5. natasha.aries
    • one year ago
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    and what do you mean @LastDayWork

  6. dumbcow
    • one year ago
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    i did find this, it may help http://en.wikipedia.org/wiki/Magnification#Calculating_the_magnification_of_optical_systems

  7. LastDayWork
    • one year ago
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    Away from the mirror can imply either side..real and virtual..

  8. LastDayWork
    • one year ago
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    @Mashy Can you help here ??

  9. Mashy
    • one year ago
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    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)

  10. LastDayWork
    • one year ago
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    XD

  11. natasha.aries
    • one year ago
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    its convex right?

  12. Mashy
    • one year ago
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    why do u think its convex?

  13. Mashy
    • one year ago
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    draw a general ray diagram for convex.. showing objects and images.. then u ll be able to uderstand..

  14. natasha.aries
    • one year ago
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    but it doesnt give you enough information to decide which one it is?

  15. Mashy
    • one year ago
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    the info is not needed.. only one of them is possible.. just draw a ray diagram.. i am telling.. that ll make u understand!

  16. natasha.aries
    • one year ago
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    i drew it and still dont see how it isnt convex

  17. natasha.aries
    • one year ago
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    oh wait! is it concave outside?

  18. Mashy
    • one year ago
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    if u drew it properly.. which distance u see bigger? object distance or image distance ?

  19. Mashy
    • one year ago
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    |dw:1392185681486:dw| this is kinda what the ray diagram is... see where the image is formed..

  20. natasha.aries
    • one year ago
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    yeah...

  21. Mashy
    • one year ago
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    so which distance is bigger in case of convex? object or image?

  22. natasha.aries
    • one year ago
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    object

  23. Mashy
    • one year ago
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    good.. so the image is ALWAYS.. ALWAYSSSS.. magnified or diminshed ?

  24. natasha.aries
    • one year ago
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    diminished

  25. Mashy
    • one year ago
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    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..

  26. natasha.aries
    • one year ago
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    yeah! would it be concave outside?

  27. Mashy
    • one year ago
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    what u mean concave outside? o.O

  28. Mashy
    • one year ago
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    there is only one type of concave :P

  29. natasha.aries
    • one year ago
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    you said there are two possibilities

  30. Mashy
    • one year ago
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    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 ?

  31. natasha.aries
    • one year ago
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    in front of and behind

  32. Mashy
    • one year ago
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    u can't be something BEHIND the mirror.. if u go BEHIND the mirror.. there is NO reflection darling!

  33. natasha.aries
    • one year ago
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    like inside the focal point and behind the focal point

  34. Mashy
    • one year ago
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    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?

  35. natasha.aries
    • one year ago
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    virtual

  36. Mashy
    • one year ago
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    perfect.. will this be magnified or diminished ?

  37. natasha.aries
    • one year ago
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    magnified

  38. Mashy
    • one year ago
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    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?

  39. natasha.aries
    • one year ago
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    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?

  40. natasha.aries
    • one year ago
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    and where did you get 200 from?

  41. Mashy
    • one year ago
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    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

  42. Mashy
    • one year ago
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    so in the real case u would end up with Real image, and -20 as the magnification!

  43. natasha.aries
    • one year ago
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    ohh! okay! thank you sooo muchh

  44. Mashy
    • one year ago
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    no problem! :) :)!

  45. natasha.aries
    • one year ago
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    :)

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