A converging lens of focal length 15 cm and a converging mirror of focal length 10 cm are placed 50 cm apart. If a pin of length 2.0 cm is placed 30 cm from the lens farther away from the mirror, where will the final image form and what will be the size of the final image ?

Explanation

Image by lens: The object is placed at 2F. The image is inverted and formed at distance 30 cm on the other side and of same size.
Image by mirror: `I_1` behaves as object for mirror and it is placed at centre of curvature of mirror. Image is reversed and formed at the same place.
Again by lens: Image of `I_2` if formed at `O`, inverted and same size. Final image is inverted, same size and formed on `O` itself.