Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
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
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

This Question is Closed

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

AadarshBest 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

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

AadarshBest 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

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

Ishaan94Best ResponseYou've already chosen the best response.2
so, get me the refractive index of Glass...
 2 years ago

Ishaan94Best ResponseYou've already chosen the best response.2
arre book mein dheko na
 2 years ago

KingBest 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

AadarshBest 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

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

KingBest 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

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

KingBest 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

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

Ishaan94Best ResponseYou've already chosen the best response.2
Oh, don't consider Glass, you will have to ignore Glass, my bad :/
 2 years ago

Ishaan94Best ResponseYou've already chosen the best response.2
btw Glass can't be ignored in real life
 2 years ago

Ishaan94Best ResponseYou've already chosen the best response.2
dw:1332858159715:dwApparent Velocity of fly = 83.
 2 years ago

Ishaan94Best ResponseYou've already chosen the best response.2
because the apparent velocity is from the frame of reference in water.
 2 years ago

saliniBest 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

saliniBest 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

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

saliniBest 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

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

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

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

saliniBest 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

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

saliniBest 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

saliniBest 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
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.