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A parallel beam of rays is incident on a consisting pf three thin lenses with a common optical axis. The focal length of the lenses are equal to `f_1=+10 cm and f_2=-20 cm, and f_3=+9 cm` respectively. The distance between the first and the second lens is `15 cm` and between the second and the third is `5 cm.` Find the position of the point at which the beam converges when it leaves the system of lenses.

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Best answer
Correct Answer - A::B::C::D
For second lens,
`1/v-1/(-5)=1/(-20) rArr v=-4 cm`
image
For third lens,
`1/v-1/-(4+9)=1/(+9)`
`:. v=oo`

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