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You are given three lenses L(1),L(2) and...

You are given three lenses `L_(1),L_(2) and L_(3)` each of focal length 10 cm. An object is kept at 15 cm in front of `L_(1),` as shown. The final real image is formed at the focus 'T' of `L_(3).` Find the separations between `L_(1),L_(2) and L_(3).`

Text Solution

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`(1)/(v)-(1)/(u)=(1)/(f_(1))`
`"Now, "f_(1)=f_(2)=f_(3)=15 cm.`
AC to lense maker formula
`(1)/(v_(1))-(1)/(u_(1))=(1)/(f_(1))rArr(1)/(v_(1))=(1)/(10)+(1)/(-15)=(3-2)/(30)=(1)/(30)`
`v_(1) = 30 cm.`
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