Optics - OPTICS : SIMPLE

1

ANKIT MAHATO ·2009-03-30 10:45:38

jaise door desh ke tower par gir jaye re aeroplane ........

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21

tapanmast Vora ·2009-03-31 05:15:15

he he........ k k k........ mayb.......

Thnx [1]

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1

ANKIT MAHATO ·2009-03-31 05:01:36

i think so the coaching institute person who set this question did the same mistake while solving it .. after all he is also a human !! :P

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33

Abhishek Priyam ·2009-03-31 05:01:01

wo sahi hai...

4,2,11

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1

ANKIT MAHATO ·2009-03-31 04:59:29

yup i agree but again we don't have any clue !!

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33

Abhishek Priyam ·2009-03-31 04:58:21

deleted that.. :P

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33

Abhishek Priyam ·2009-03-31 04:56:47

calculation mistake... :P hota hai kabhi kabhi... velocity of obj and mirror ek dusre ka le liye .. :D

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1

ANKIT MAHATO ·2009-03-31 04:56:33

see this guys .. is it incorrect ??

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1

ANKIT MAHATO ·2009-03-31 04:50:34

@ priyam

Velcoity of object wrt mirror = -2i-j+7k

now velcoity of image along perpendicular direction is not changed and along normal direction is reversed
so v of im wrt mirror =-2i-j-7k

v of image wrt ground =2i+j-10k

Velocity of object wrt mirror = Velocity of object wrt groud - Velocity of mirror wrt ground = (4i + 2j - 3k) - (2i + j + 4k) = 2i + j - 7k // not matching with urs ..

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33

Abhishek Priyam ·2009-03-31 04:15:13

wrt ground i think

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13

deepanshu001 agarwal ·2009-03-31 04:08:01

the velocity w.r,t to wat do v hav to find....

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21

tapanmast Vora ·2009-03-31 01:03:54

O okie.........

ye aise karte hain [12]

thnx [1]

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1357

Manish Shankar ·2009-03-31 00:48:41

It seems that ankit has solved it correctly

I m also getting the answer as 4i+2j+11k

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21

tapanmast Vora ·2009-03-30 21:15:38

Phy Experts!!!! Pl. help HERE!!!!

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1

vector ·2009-03-30 11:50:57

even me getting same ans as riddle

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1

ANKIT MAHATO ·2009-03-30 11:10:03

where did i went wrong ??i used simple concepts ...

everything is calculated relative to the mirror .. i don't think it is bad to do so ...

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1

ANKIT MAHATO ·2009-03-30 06:14:46

by the way ! don't try to show off that u work out ur questions in every nook and corner of ur paper !!

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11

Mani Pal Singh ·2009-03-30 10:34:13

YAAR DOBARA DEKHTA HOON

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21

tapanmast Vora ·2009-03-30 10:32:53

MANI : ans is B NOT A [2]

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1

ANKIT MAHATO ·2009-03-30 10:19:16

i think i got the error .. i have not taken the velocity of object w.r.t. a fixed pt ..

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21

tapanmast Vora ·2009-03-30 10:19:12

Arre yaar reson aate hain to batao!!

Mani : read # 11

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11

Mani Pal Singh ·2009-03-30 10:18:20

tapan my answer is coming out to be A
please tell if correct ten i will tell how!!!!!!!!!!

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1

Optimus Prime ·2009-03-30 09:52:48

ya u are rite tapanmast[3]

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21

tapanmast Vora ·2009-03-30 09:08:08

the answer givn is B

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1

Â°áƒ¦â€¢à¹“ÑÏ…Î ·2009-03-30 08:54:18

vel of image is twice that of objct

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1

sriraghav ·2009-03-30 08:50:23

Relative velocity conceptI am gettin 2 i + j - 7 k with respect to the mirror... Am i rite??[7][7]

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1

nithin.yes ·2009-03-30 08:21:37

velocity of image with respect to what?

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1

ANKIT MAHATO ·2009-03-30 07:11:03

yaar first keep the object speed 0 and let mirror move with V_mâ†’ vector .. u will see that image is moving with 2V_mâ†’ ...
now keep mirror speed 0 and the object speed V_oâ†’ vector .. u will see that image is moving with -V₀â†’ ...
now i combined both cases and got the answer .

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21

tapanmast Vora ·2009-03-30 06:55:46

OH kya [11]

Sir pl. confirm!!!

BTW wat was ur methd??

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1

ANKIT MAHATO ·2009-03-30 06:42:40

11k coming .. 2V_m - V_o = velocity of image .. i think question is wrong !

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