In Figure, L 1 is a thin converging lens having a focal length of magnitude 20.0

Question

In Figure, L1 is a thin converging lens having a focal length of magnitude 20.0 cm, and L2 is a thin converging lens with focal length of magnitude 30.0 cm. The location of the final image produced by this combination of lenses, relative to L2, is closest to:

300 cm to the right of L2


107 cm to the right of L2


41.7 cm to the left of L2


33.3 cm to the left of L2


39.4 cm to the right of L2
n Figure, L1 is a thin converging lens having a focal length of magnitude 20.0 cm, and L2 is a thin converging lens with focal length of magnitude 30.0 cm. The location of the final image produced by this combination of lenses, relative to L2, is closest to: 300 cm to the right of L2 107 cm to the right of L2 41.7 cm to the left of L2 33.3 cm to the left of L2 39.4 cm to the right of L2

Explanation / Answer

1/q = 1/(f1) - 1/(p1) = 1/20 - 1/50

q1 = 33.3333 cm

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p2 = 75 - 33.3333 = 41.6667 cm

q2 = 1/(f2) - 1/(p2) = 1/30 - 1/41.6667

>>>> q2 = 107 cm

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Answer: 107 cm to the right of L2

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