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King Group Title

A convex mirror of focal length f produces an image half of the size of the object. What is the distance of the object from the mirror?

  • 2 years ago
  • 2 years ago

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  1. Aadarsh Group Title
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    Use lens formula

    • 2 years ago
  2. King Group Title
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    1/v-1/u=1/f? that one?

    • 2 years ago
  3. Aadarsh Group Title
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    Object distance = -u image distance = v Height of image / height of object = v/u

    • 2 years ago
  4. King Group Title
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    hi/ho=-v/u

    • 2 years ago
  5. King Group Title
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    can u do it?

    • 2 years ago
  6. Aadarsh Group Title
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    yeah

    • 2 years ago
  7. King Group Title
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    yeah as in can u post the sol.?

    • 2 years ago
  8. Aadarsh Group Title
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    see now, h / 2h = v/u u = 2v

    • 2 years ago
  9. King Group Title
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    ok

    • 2 years ago
  10. Aadarsh Group Title
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    \[1divv -1divu =1divf\]

    • 2 years ago
  11. King Group Title
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    \[1/v-1/u=1/f\]

    • 2 years ago
  12. Aadarsh Group Title
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    |dw:1332858999064:dw|

    • 2 years ago
  13. King Group Title
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    why is it -2v?

    • 2 years ago
  14. Aadarsh Group Title
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    Becoz, in calculation, u should take object distance as negative. So, u becomes -u. And hence -2v

    • 2 years ago
  15. King Group Title
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    ok so u get 3/2v=1/f 2v=3f

    • 2 years ago
  16. King Group Title
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    after that?

    • 2 years ago
  17. King Group Title
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    aadarsh u der?

    • 2 years ago
  18. Aadarsh Group Title
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    Then, equate v = 3f / 2

    • 2 years ago
  19. Aadarsh Group Title
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    Substitute it in the formula: 1/v - 1/u = 1/f

    • 2 years ago
  20. King Group Title
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    i get u=3f

    • 2 years ago
  21. Aadarsh Group Title
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    U r correct

    • 2 years ago
  22. King Group Title
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    so that it?

    • 2 years ago
  23. King Group Title
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    answer is -f

    • 2 years ago
  24. Aadarsh Group Title
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    Yeah, soorry. Then don't use - 2v in the formula. use 2v. U may get it.

    • 2 years ago
  25. King Group Title
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    i get u=f

    • 2 years ago
  26. King Group Title
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    ok.thnx gtg!1

    • 2 years ago
  27. King Group Title
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    bye

    • 2 years ago
  28. Aadarsh Group Title
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    Oooooooooooo. Gtg. Byeeeeeeeeeee. ur result?

    • 2 years ago
  29. King Group Title
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    in what 9th .....94.83%

    • 2 years ago
  30. King Group Title
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    kk bye!

    • 2 years ago
  31. Aadarsh Group Title
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    Super. Congrtas. Ready for US trip?????????????

    • 2 years ago
  32. King Group Title
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    yup!

    • 2 years ago
  33. Aadarsh Group Title
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    PLz reply to my email. plzzzzzzzzzzz

    • 2 years ago
  34. King Group Title
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    ok

    • 2 years ago
  35. Aadarsh Group Title
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    Byeeeee

    • 2 years ago
  36. salini Group Title
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    @aadarsh, u have successfully completed 10th so tell me, can a convex mirror produce an image which is half of the object's height?

    • 2 years ago
  37. Aadarsh Group Title
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    Arre Shalini didi and king, I think I was in a dream while solving this question. I thought it to be a convex lens instead of a mirror. Here is the detailed answer. Sorry for mistake.

    • 2 years ago
  38. Aadarsh Group Title
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    Mirror Formula: 1/v + 1/u = 1/f And, h'/h = -v/u (magnification formula) So, given, h'/h = -v/u = 1/2............(i) So, u = -2v.......(ii) Now, 1/v + 1/(-2v) = 1/f Or, 1/2v = 1/f Or, f = 2v Or, f = 2v So, f = -u [From (ii)]

    • 2 years ago
  39. salini Group Title
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    u havent answered my question yet aadarsh can a convex mirror , produce an image which is half of the object's height? i wud like to add one thing here be very clear to visualise the ray diagrams for any lens or mirror b4 solving sum

    • 2 years ago
  40. Aadarsh Group Title
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    @salini akka, i think a convex mirror can produce an image half size of that of object, in some cases, when object is between infinity and pole of mirror.

    • 2 years ago
  41. salini Group Title
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    oh my! check ur 10th book aadarsh

    • 2 years ago
  42. Aadarsh Group Title
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    didi, its given that it will form a diminished, virtual and erect image. That's all na?????????

    • 2 years ago
  43. salini Group Title
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    ya so will it produce a half-sized image?

    • 2 years ago
  44. Aadarsh Group Title
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    not really. BUt can it not produce in some cases???????????????

    • 2 years ago
  45. salini Group Title
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    i am curious when? when our bible says no it is a no u know wat i mean by bible dont u?

    • 2 years ago
  46. Aadarsh Group Title
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    Yeah, "Bible" means Book. (NCERT) Can u plz say why it cannot?

    • 2 years ago
  47. salini Group Title
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    its the property of convex mirror to always form virtual diminished(not even the quarter of size of object)_ how? it was found by great ppl all we do is read them right?

    • 2 years ago
  48. salini Group Title
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    whenever u see a question related to lens or mirrors flash the image formation diagrams b4 the formula @king ur question is wrong

    • 2 years ago
  49. Aadarsh Group Title
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    How didi? question is wrong? See my process . Everything is correct. But u r true taht a convex mirror cannot form an half image image.

    • 2 years ago
  50. salini Group Title
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    :) see ur text book and read my last comment it will help u

    • 2 years ago
  51. Aadarsh Group Title
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    Yeah, u r rite didi. I was mad at the first itself.

    • 2 years ago
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