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A concave mirror of focal length 10 cm i...

A concave mirror of focal length 10 cm is placed at a distance 35 cm from a wall. How far from the wall should an object be placed so that its real image is formed on the wall ?

Text Solution

Verified by Experts

`"f = 10 cm, "upsilon " = 35 cm"`
`(1)/(f)=(1)/(upsilon)+(1)/(-u)" (using sign convention)"`
`(1)/(u)=(1)/(upsilon)-(1)/(f)=(1)/(35)-(1)/(10)`
`(1)/(u)=(10-35)/(35xx10)=(-1)/(14)`
`U = -14cm.`
Distance of the object from the wall `=35-14=21cm`.
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