physics

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a concave mirror of diameter 40m is used with a 6cm tall object placed 20 cm from it. Where is the image?
Can you check my solution
Radius(R)=20cm
Distance object(do)=20cm
(2/R)=(1/do)+(1/di)
(1/di)=(2/R)-(1/do)
why do they give you the object height i don't think you need to use it?

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