Question

Question #fadc9

Answer 1

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

Explanation:

`"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"`