A parallel beam of light is incident on a system consisting of thre...

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A parallel beam of light is incident on a system consisting of three thin lenseswith a common optical axis. The focal lengths
\( \mathrm{P} \) of the lenses are equal to \( f_{1}=10 \mathrm{~cm} \) (converging) and \( f_{2}=20 \mathrm{~cm} \)

W (divering)and \( f_{3}=9 \mathrm{~cm} \) (converging) respectively. The distance between the first and the second lens is \( 15 \mathrm{~cm} \) and between the second and the third is \( 5 \mathrm{~cm} \). Find the position of the point at which the beam converges when it leaves the system of lenses.
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