# If for a concave mirror when object distance is 60cm. The magnification is 1/2. So, what should be the object distance so that the magnification is 1/3?

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by saau

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by saau

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The Brainliest Answer!

magnification(m)=1/2

m= -v/u

∴1/2= -v/60

∴-v = 30

∴ v= -30 cm

now m= 1/3

v = -30 cm

∴m= -v/u

∴ 1/3 = -(-30)/u

∴u= 90cm ans

60cm away. 60-----1/2 x-------1/3 60*1/2=1/3x 30=1/3x 30*3=x 90cm=x