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Aadarsh

  • 2 years ago

The magnification of a magnifying lens of focal length 5 cm is :(final image is at infinity) a) 1 b) 2 c) 3 d) 5

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  1. salini
    • 2 years ago
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    wat si the type of lens that magnifies ur imge and also produces a virtual image? answer this question then wat is the ray diagram for getting image at infinity with that type of lens? wat is lens formula relating f,u,v i can get my v from that? wat is magnification? in terms of u and v u are near the answer once u have ansered all these questions

  2. Aadarsh
    • 2 years ago
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    The lens must be a convex lens. The object is at focus.

  3. Aadarsh
    • 2 years ago
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    \[1/v - 1/u = 1/f\]

  4. Aadarsh
    • 2 years ago
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    Here, v = 0

  5. Aadarsh
    • 2 years ago
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    Also, m = v/u

  6. Aadarsh
    • 2 years ago
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    But, I am not getting the answer.

  7. salini
    • 2 years ago
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    put down the ray diagram for me when image is at infinity for convex lens

  8. Aadarsh
    • 2 years ago
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    Just one minute. Here is the diagram.

  9. Aadarsh
    • 2 years ago
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    |dw:1333555806014:dw|

  10. Aadarsh
    • 2 years ago
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    @salini didi, Now say what to do.

  11. salini
    • 2 years ago
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    yeah so? u=?

  12. salini
    • 2 years ago
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    object disatnce=?

  13. Aadarsh
    • 2 years ago
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    u = 5

  14. salini
    • 2 years ago
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    then? tell me how do i proceed?

  15. Aadarsh
    • 2 years ago
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    m = f/(f+u) = 5/(5+5) = 0.5?????

  16. salini
    • 2 years ago
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    m=v/u u never used taht?

  17. Aadarsh
    • 2 years ago
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    But how to do? Please say in detail the complete steps.

  18. salini
    • 2 years ago
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    u know that formula?

  19. Aadarsh
    • 2 years ago
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    U say akka. PLease.

  20. salini
    • 2 years ago
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    i forgot for lenses tahts y ia m asking u

  21. Aadarsh
    • 2 years ago
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    Ohhhhhhh!!! Can u please post the details tomorrow? I have to go now. Bye.

  22. salini
    • 2 years ago
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    ok bye! see pg.182 of 10th ncert text book

  23. Aadarsh
    • 2 years ago
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    Okay, will look and say tomorrow.

  24. Aadarsh
    • 2 years ago
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    Its given that, m = v/u = h1 / h2

  25. salini
    • 2 years ago
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    yeah so u know u, find V using lens formula then apply u/v to find magnification(the extent to which the image is magnified w.e.to object) the key here is taht u=focal length that u will come to know ONLY WHEN U DRAW THE RAY DIAGRAM!

  26. Aadarsh
    • 2 years ago
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    But, v = 0 na?

  27. salini
    • 2 years ago
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    1/f=1v-1/u 1/v=1/f+1/u by sign convention f=-5 u=-5

  28. Aadarsh
    • 2 years ago
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    @salini didi, then, m = f/(f+u) = 5[5 + (-5)] = 5/0?????

  29. salini
    • 2 years ago
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    v=?

  30. Aadarsh
    • 2 years ago
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    v = 0, rite?

  31. salini
    • 2 years ago
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    U learnt ssign convention?>

  32. Aadarsh
    • 2 years ago
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    yeah. U try and see. This problem uses some different formula. Then only we can get it.

  33. salini
    • 2 years ago
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    i will get back to you later after searching abt this problem

  34. Aadarsh
    • 2 years ago
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    OK.

  35. Aadarsh
    • 2 years ago
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    U r correct didi!!!!!! Cheers!!!!!!! thanks for the solution.

  36. salini
    • 2 years ago
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    :) we learn nothing...........there is so much to learn further

  37. Aadarsh
    • 2 years ago
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    Oooooooooo. But, it is a continous process. Being happy is also a continuous process. So, be happy!!!!!!:P

  38. salini
    • 2 years ago
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    !!!!!!!!!!!!!!!!!! i dont know wat to type :)

  39. Aadarsh
    • 2 years ago
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    Hehehehheheheheh!!!!!!!!!! Crazy Sister!!!!!!!!!!!!!

  40. Aadarsh
    • 2 years ago
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    Can't stop laughing!!!!!!!!!!!!!!!!!!!!

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