speed of image
Forum » Physics / Optics » speed of image
Started by: Karan SinghKaran Singh
On: 1208260834|%e %b %Y, %H:%M %Z|agohover
Number of posts: 4
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a question relating to speed of image in a convex mirror. to know more, click on the above.
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speed of image
Karan SinghKaran Singh 1208260834|%e %b %Y, %H:%M %Z|agohover

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.

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unfold speed of image by Karan SinghKaran Singh, 1208260834|%e %b %Y, %H:%M %Z|agohover
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Re: speed of image
pardesipardesi 1208262152|%e %b %Y, %H:%M %Z|agohover

The mirror equation gives u
\frac{1}{v} +\frac{1}{u}=\frac{1}{f} where the ysmbols have their usual meaning
now differentiating we get
\frac{-dv}{v^{2}dt} + \frac{-du}{u^{2}dt}=0 as \frac{d(\frac{1}{f})}{dt}=0
so u get v_{i}=\frac{v^{2}v_{o}}{u^{2}} so plugging the values we get the answer
hope u get the differentaiton part

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unfold Re: speed of image by pardesipardesi, 1208262152|%e %b %Y, %H:%M %Z|agohover
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Re: speed of image
The InventorThe Inventor 1208263266|%e %b %Y, %H:%M %Z|agohover

hey see my reply on goiit
:-)

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unfold Re: speed of image by The InventorThe Inventor, 1208263266|%e %b %Y, %H:%M %Z|agohover
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Re: speed of image
Karan SinghKaran Singh 1208330005|%e %b %Y, %H:%M %Z|agohover

thanks to all

i got the answer :)

it was quite easy

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unfold Re: speed of image by Karan SinghKaran Singh, 1208330005|%e %b %Y, %H:%M %Z|agohover
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