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King Group Title

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!!!:(

  • 2 years ago
  • 2 years ago

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  1. Aadarsh Group Title
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    Is it 4 m/s?

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

    • 2 years ago
  3. Aadarsh Group Title
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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

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

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

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

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

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

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

    • 2 years ago
  10. King Group Title
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    hw?

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

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

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

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

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

    • 2 years ago
  16. King Group Title
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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?

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

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

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

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

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

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

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

    • 2 years ago
  24. King Group Title
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    ok

    • 2 years ago
  25. King Group Title
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    why?

    • 2 years ago
  26. King Group Title
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    why ?

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

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

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

    • 2 years ago
  30. King Group Title
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    posted!

    • 2 years ago
  31. salini Group Title
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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

    • 2 years ago
  32. salini Group Title
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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

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

    • 2 years ago
  34. salini Group Title
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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)

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

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

    • 2 years ago
  37. King Group Title
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    expression fr wat?

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

    • 2 years ago
  39. King Group Title
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    idk

    • 2 years ago
  40. salini Group Title
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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

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

    • 2 years ago
  42. King Group Title
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    bye!

    • 2 years ago
  43. salini Group Title
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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!

    • 2 years ago
  44. salini Group Title
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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

    • 2 years ago
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