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King

  • 2 years ago

A fish in an aquarium approaches the left wall at a rate of 3 m/s and observes a fly approaching it at 8 m/s. If the refractive index of water is 4/3, find the actual velocity of the fly.Explain with steps..pls help!!!:(

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  1. Aadarsh
    • 2 years ago
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    Is it 4 m/s?

  2. King
    • 2 years ago
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    actual velocity of fly=3.75m/s

  3. Aadarsh
    • 2 years ago
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    We know that, Speed of light in air / Speed of light in water = 4/3 Or, 3 * 10^8 / x = 4/3 Or, x = 2.25 * 10^8 Now, 2.25*10^8 = 3 So, 3*10^8 = 3/(2.25 * 10^8) * 3*10^8 = 9/2.25 = 4

  4. Aadarsh
    • 2 years ago
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    Not getting how it is 3.75 m/s

  5. King
    • 2 years ago
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    wait hw is 2.25*10^8=3?

  6. Aadarsh
    • 2 years ago
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    I just equated for the sake of unitary method, since fish is in water. It may be wrong.

  7. Ishaan94
    • 2 years ago
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    |dw:1332857679054:dw|

  8. King
    • 2 years ago
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    ok the ray refracts twice so?

  9. Ishaan94
    • 2 years ago
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    so, get me the refractive index of Glass...

  10. King
    • 2 years ago
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    hw?

  11. Ishaan94
    • 2 years ago
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    arre book mein dheko na

  12. King
    • 2 years ago
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    oh..i dont hav a book mein 10th mein hoon just passed this prob is frm a sample paper

  13. Aadarsh
    • 2 years ago
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    Given taht R.F. of water is 4/3. Glass refractive index = 1.52(crown glass)

  14. King
    • 2 years ago
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    acc. to google it is 1.52

  15. King
    • 2 years ago
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    yeah and fr flint glass it is 1.62

  16. King
    • 2 years ago
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    For the fish, the apparent distance of the fly from the wall of the aquarium is µx, where µ is the R.I. of water and x is the actual distance, then apparent velocity will be . Therefore, actual velocity of fly = (8 – 3) * (3/4) = 3.75 m/s. This is the sol. given can u explain this?

  17. Aadarsh
    • 2 years ago
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    Check in 10th NCERT, crown glass' R.F. is 1.52

  18. King
    • 2 years ago
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    yeah i know that i just told fr flint glas it is 1.62

  19. King
    • 2 years ago
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    so salini,ishaan,aadarsh can a ny of u explain the above sol.?

  20. Ishaan94
    • 2 years ago
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    Oh, don't consider Glass, you will have to ignore Glass, my bad :/

  21. Ishaan94
    • 2 years ago
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    btw Glass can't be ignored in real life

  22. King
    • 2 years ago
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    ok so what to do nw?

  23. Ishaan94
    • 2 years ago
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    |dw:1332858159715:dw|Apparent Velocity of fly = 8-3.

  24. King
    • 2 years ago
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    ok

  25. King
    • 2 years ago
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    why?

  26. King
    • 2 years ago
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    why ?

  27. Ishaan94
    • 2 years ago
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    because the apparent velocity is from the frame of reference in water.

  28. King
    • 2 years ago
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    ok..ok yeah....

  29. King
    • 2 years ago
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    ok 1 more..

  30. King
    • 2 years ago
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    posted!

  31. salini
    • 2 years ago
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    u have to have an idea abt relative velocity ie velocity of f fly with res[pect to velocity of fish(since both are moving) Vfly-Vfish=relative velocity of fly with respect to fish in water i think u can figure out the rest

  32. salini
    • 2 years ago
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    IN WATER CONDITION is wat i have discussed above so do the same thing in air using R.I multiply by 3/4

  33. King
    • 2 years ago
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    can u pls xplain why i hav to divide by refractive index

  34. salini
    • 2 years ago
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    wat is R.I? DID u understand the relative velocity part(it is nothing but how the fish sees the fly when it is moving)

  35. King
    • 2 years ago
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    refractive index ya i understood the r.v part

  36. salini
    • 2 years ago
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    right wat is the expression?

  37. King
    • 2 years ago
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    expression fr wat?

  38. salini
    • 2 years ago
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    refractive index of medium 1 with respect to medium 2?

  39. King
    • 2 years ago
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    idk

  40. salini
    • 2 years ago
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    it is speed of light in medium 2/speed of light in medium 1 =r.i of medium 2 use this and put the values u

  41. King
    • 2 years ago
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    @salini sry gtg can u pst solution and i shall se it tom

  42. King
    • 2 years ago
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    bye!

  43. salini
    • 2 years ago
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    thts ball u gotto work out with the expressions i gave remember it is velocity of fly in water (actual) that i gave u with relative velocity concept bye! my god this site is very slow!

  44. salini
    • 2 years ago
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    |dw:1332861296812:dw|so when u do the pproblem Vmf is only given Vmf=Vm-Vf 8=Vm-(-3) that is how it is 5m/s velocity of moth in water

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