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Cool goIITian

Joined:	19 Aug 2007
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14 Oct 2008 11:59:13 IST

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506

OPTICS DOUBT PLZ ANSWER IT TODAY BEFORE 4 0 CLOCK

None

A MAN IS INFRONT OF PLANE MIRROR .THE MAN WALKS TOWARDS THE MIRROR WITH SPEED OF 2 M/S WHILE MIRROR MOVE TOWARDS MAN WITH 1M/S WHAT WILL BE THE APPARENT SPEED OF IMAGE OF THE MAN AS SEEN BY HIMSELF?

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harsh

Scorching goIITian

Joined: 3 May 2008

Posts: 288

14 Oct 2008 16:58:30 IST

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let the initial istance of the oject frm the mirror e 10 m ......the image will also e at a istance of 10 m ehin the mirror ...i.i the istance etween the oject n the image is 20 m ........

nw after 1 sec ...the man moves 2 m towrs the mirror n the mirror moves 1 m towrs the man so nw the ist ween the oject n the mirror is 7 m n so the istance etween the image n the mirror will also e 7 m i.e the istance ween the man n the image will e 14 m ....

so THE APPARENT SPEED OF IMAGE OF THE MAN AS SEEN BY HIMSELF will e 6 m/s(20-14) ...............

rate if useful ....correct if wrong....

diya

Hot goIITian

Joined: 13 Oct 2008

Posts: 103

16 Oct 2008 09:00:58 IST

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why dont u simply differentiate the magnification formula

m= -v/u

diff wrt to time, m=1(plane mirror)

-du/dt=dv/dt (both of these r wrt to the mirror)

u(absolute object speed)-x(absolute speed of mirror)=v(absolute image speed)-x

now cal ,v-u

harsh

Scorching goIITian

Joined: 3 May 2008

Posts: 288

17 Oct 2008 23:30:57 IST

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hey i m a tenth graer ...i ont kno iffrentiation

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