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An object is placed at a distance of 20 ...

An object is placed at a distance of 20 cm from a thin double convex lens of focal length 15 cm. Find the position and magnification of the image.

Text Solution

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Given that u = 20 cm, f = 15 cm
`(1)/(f)=(1)/(v)+(1)/(u)`
`(1)/(v)=(1)/(f)-(1)/(u)=(1)/(15)-(1)/(20)`
`(1)/(v)=(20-15)/(15xx20)=(5)/(15xx20)`
`(1)/(v)=(1)/(60)`
`"v = 60 cm."`
`"Magnification (m) "=(-v)/(u)`
`m=(-60)/(-20)(u=-20cm)`
m = 3
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