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A concave lens of focal length 15 cm for...

A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens ? Draw the ray diagram.

Text Solution

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Focal length of concave lens `(OF_1)`,f=-15cm
Image distance, `v=-10cm` According to the lens formula,
`1/v-1/u=1/f`
`1/u=1/v-1/f`
`=(-1)/(10)-1/(-15)=(-1)/(10)+1/(15)=(-5)/(150)`
u=-30cm
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