Question #fadc9

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Question #fadc9

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Answer 1 · 2016-06-22T20:17:47

$"a :Object distance is 20 cm"$
$"b :Mirror is convex"$

Explanation:

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$"given:"$

$f:"focus :r:radius ;g:length of image ; c:length of object"$
$u="distance between object and mirror"$
$u'="distance between image and mirror"$
$r=60" cm ; f="60/2="30 cm"$

$g/c=(u')/u" ; "6/10=(u')/u" ; "u'=(6u)/10$

$-1/f=1/u-1/(u')" equation for convex mirrors"$

$-1/30=1/u-1/((6u)/10)$

$-1/30=1/u-10/(6u)$

$-1/30=(6-10)/(6u)$

$-1/30=-4/(6u)$

$120=6u$

$u=20" cm"$

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