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Draw a labelled ray diagram to locate the image of an object fromed by a convex lens of focal length 20 cm when the object is placed 30 cm away from the lens.

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Here, `v=?, f=20 cm, u= -30 cm`,
From `(1)/(v)-1/u=(1)/(f)`,
`(1)/(v)=(1)/(f)+1/u=(1)/(20)-(1)/(30)=(3-2)/(60)=(1)/(60)`
`v=60 cm`
The labelled ray diagram is
image

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