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A thin converging lens forms a real image of an object located far away from the lens. The image is formed at A at a distance 4x from the lens and height of the image is h. A thin diverging lens of focal length x is placed at `B [PB = 2x]` and a converging lens of focal length 2x is placed at `C [PC = 3x]`. The principal axes of all lenses coincide. Find the height of the final image formed. A. `h`B. `(h)/(2)`C. `4h`D. `2h` |
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Answer» From `2^(nd)` lens `(1)/(9v)-(1)/(2l)=(1)/(-l)` or `v=-2l` `m_(1)=-1` From `3^(rd)` lens `(1)/(v)-(1)/(-3l)=(1)/(2l)` or `v=6l` `m_(2)=-2` `h_(i)(m_(1)xxm_(2))h_(0)` `=2h` |
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