| Author |
Message |
![[Post New]](/templates/default/images/icon_minipost_new.gif) 15 Apr 2008 17:11:03 IST
|
|
|
An object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. If the object is made to move away from the mirror with a speed of 5 cm/s, find the speed of image with respect to pole of the mirror.
plz justify ur answer as well.
|
|
|
|
15 Apr 2008 17:24:31 IST
|
|
|
is the answer 0.01cm/s towards the mirror
|
this reply: 5 points
(with 1 
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
|
|
|
|
the ost cud have been less colourful
just use the formula 1/v + 1/u=1/f and diff both sides with respect to t
|
KVS
EP@IITM
Godav,IITM |
this reply: 5 points
(with 1
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
15 Apr 2008 17:29:05 IST
|
|
|
ya differentiate the equation
|
this reply: 10 points
(with 2
in 2 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
15 Apr 2008 17:30:10 IST
|
|
|
how ???
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
15 Apr 2008 17:31:07 IST
|
|
|
tell me if my answer is correct
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
15 Apr 2008 17:38:15 IST
|
|
|
i get the answer as 1 cm/s away from mirror.
ashish kindly check ur answer as it will definitely be away form mirror as when obj is at infinity , image is at focus.
c'mon guys ?
\
the procedure
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
15 Apr 2008 17:41:52 IST
|
|
|
i would like to enquire if the above question can be solved without calculus................??????????????
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
15 Apr 2008 17:55:58 IST
|
|
|
f is constant
so we get
-1/v^2*dv/dt=1/u^2*du/dt
so we get dv/dt=-v^2/u^2*du/dt
calculate v by formula
put the values n get d ans............................
|
this reply: 15 points
(with 3
in 3 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
20 Apr 2008 17:51:37 IST
|
|
|
answer is 0.01cm from convex mirror
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
|
|
Moderation Team
![[Up]](/templates/default/images/icon_up.gif "[Up]"){kind=icon}
1
