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natasha.aries

  • 10 months 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
    • 10 months 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
    • 10 months ago
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    What do you understand by "..away from the mirror.." ??

  3. dumbcow
    • 10 months ago
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    sorry i am not familiar with these type of problems

  4. natasha.aries
    • 10 months ago
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    Its okay @dumbcow

  5. natasha.aries
    • 10 months ago
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    and what do you mean @LastDayWork

  6. dumbcow
    • 10 months 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
    • 10 months ago
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    Away from the mirror can imply either side..real and virtual..

  8. LastDayWork
    • 10 months ago
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    @Mashy Can you help here ??

  9. Mashy
    • 10 months 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
    • 10 months ago
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    XD

  11. natasha.aries
    • 10 months ago
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    its convex right?

  12. Mashy
    • 10 months ago
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    why do u think its convex?

  13. Mashy
    • 10 months 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
    • 10 months ago
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    but it doesnt give you enough information to decide which one it is?

  15. Mashy
    • 10 months 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
    • 10 months ago
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    i drew it and still dont see how it isnt convex

  17. natasha.aries
    • 10 months ago
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    oh wait! is it concave outside?

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

  19. Mashy
    • 10 months 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
    • 10 months ago
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    yeah...

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

  22. natasha.aries
    • 10 months ago
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    object

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

  24. natasha.aries
    • 10 months ago
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    diminished

  25. Mashy
    • 10 months 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
    • 10 months ago
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    yeah! would it be concave outside?

  27. Mashy
    • 10 months ago
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    what u mean concave outside? o.O

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

  29. natasha.aries
    • 10 months ago
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    you said there are two possibilities

  30. Mashy
    • 10 months 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
    • 10 months ago
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    in front of and behind

  32. Mashy
    • 10 months 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
    • 10 months ago
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    like inside the focal point and behind the focal point

  34. Mashy
    • 10 months 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
    • 10 months ago
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    virtual

  36. Mashy
    • 10 months ago
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    perfect.. will this be magnified or diminished ?

  37. natasha.aries
    • 10 months ago
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    magnified

  38. Mashy
    • 10 months 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
    • 10 months 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
    • 10 months ago
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    and where did you get 200 from?

  41. Mashy
    • 10 months 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
    • 10 months 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
    • 10 months ago
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    ohh! okay! thank you sooo muchh

  44. Mashy
    • 10 months ago
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    no problem! :) :)!

  45. natasha.aries
    • 10 months ago
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    :)

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