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King
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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
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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Aadarsh Group TitleBest ResponseYou've already chosen the best response.1
Is it 4 m/s?
 2 years ago

King Group TitleBest ResponseYou've already chosen the best response.0
actual velocity of fly=3.75m/s
 2 years ago

Aadarsh Group TitleBest ResponseYou've already chosen the best response.1
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

Aadarsh Group TitleBest ResponseYou've already chosen the best response.1
Not getting how it is 3.75 m/s
 2 years ago

King Group TitleBest ResponseYou've already chosen the best response.0
wait hw is 2.25*10^8=3?
 2 years ago

Aadarsh Group TitleBest ResponseYou've already chosen the best response.1
I just equated for the sake of unitary method, since fish is in water. It may be wrong.
 2 years ago

Ishaan94 Group TitleBest ResponseYou've already chosen the best response.2
dw:1332857679054:dw
 2 years ago

King Group TitleBest ResponseYou've already chosen the best response.0
ok the ray refracts twice so?
 2 years ago

Ishaan94 Group TitleBest ResponseYou've already chosen the best response.2
so, get me the refractive index of Glass...
 2 years ago

Ishaan94 Group TitleBest ResponseYou've already chosen the best response.2
arre book mein dheko na
 2 years ago

King Group TitleBest ResponseYou've already chosen the best response.0
oh..i dont hav a book mein 10th mein hoon just passed this prob is frm a sample paper
 2 years ago

Aadarsh Group TitleBest ResponseYou've already chosen the best response.1
Given taht R.F. of water is 4/3. Glass refractive index = 1.52(crown glass)
 2 years ago

King Group TitleBest ResponseYou've already chosen the best response.0
acc. to google it is 1.52
 2 years ago

King Group TitleBest ResponseYou've already chosen the best response.0
yeah and fr flint glass it is 1.62
 2 years ago

King Group TitleBest ResponseYou've already chosen the best response.0
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

Aadarsh Group TitleBest ResponseYou've already chosen the best response.1
Check in 10th NCERT, crown glass' R.F. is 1.52
 2 years ago

King Group TitleBest ResponseYou've already chosen the best response.0
yeah i know that i just told fr flint glas it is 1.62
 2 years ago

King Group TitleBest ResponseYou've already chosen the best response.0
so salini,ishaan,aadarsh can a ny of u explain the above sol.?
 2 years ago

Ishaan94 Group TitleBest ResponseYou've already chosen the best response.2
Oh, don't consider Glass, you will have to ignore Glass, my bad :/
 2 years ago

Ishaan94 Group TitleBest ResponseYou've already chosen the best response.2
btw Glass can't be ignored in real life
 2 years ago

King Group TitleBest ResponseYou've already chosen the best response.0
ok so what to do nw?
 2 years ago

Ishaan94 Group TitleBest ResponseYou've already chosen the best response.2
dw:1332858159715:dwApparent Velocity of fly = 83.
 2 years ago

Ishaan94 Group TitleBest ResponseYou've already chosen the best response.2
because the apparent velocity is from the frame of reference in water.
 2 years ago

King Group TitleBest ResponseYou've already chosen the best response.0
ok..ok yeah....
 2 years ago

salini Group TitleBest ResponseYou've already chosen the best response.0
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) VflyVfish=relative velocity of fly with respect to fish in water i think u can figure out the rest
 2 years ago

salini Group TitleBest ResponseYou've already chosen the best response.0
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

King Group TitleBest ResponseYou've already chosen the best response.0
can u pls xplain why i hav to divide by refractive index
 2 years ago

salini Group TitleBest ResponseYou've already chosen the best response.0
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

King Group TitleBest ResponseYou've already chosen the best response.0
refractive index ya i understood the r.v part
 2 years ago

salini Group TitleBest ResponseYou've already chosen the best response.0
right wat is the expression?
 2 years ago

King Group TitleBest ResponseYou've already chosen the best response.0
expression fr wat?
 2 years ago

salini Group TitleBest ResponseYou've already chosen the best response.0
refractive index of medium 1 with respect to medium 2?
 2 years ago

salini Group TitleBest ResponseYou've already chosen the best response.0
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

King Group TitleBest ResponseYou've already chosen the best response.0
@salini sry gtg can u pst solution and i shall se it tom
 2 years ago

salini Group TitleBest ResponseYou've already chosen the best response.0
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

salini Group TitleBest ResponseYou've already chosen the best response.0
dw:1332861296812:dwso when u do the pproblem Vmf is only given Vmf=VmVf 8=Vm(3) that is how it is 5m/s velocity of moth in water
 2 years ago
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