The 2 "half mirrors" separated by 1 cm is equivalent to 2 full mirrors whose principal axis' are at a distance of 1 cm from each other , with the object in between as shown in the figure. [![F1,F2 are the 2 focal lengths][1]][1]

From the figure, we can say that the object distance are the same for the 2 mirrors. The only thing different will be the image heights, whose direction will be opposite of each other and the magnitudes will be the same.
Using the mirror formula, we get the images will be formed at a distance 30 cm in front of the mirror and at a height of 2 cm on either sides of the original principle axis. [1]: https://i.sstatic.net/xCiIu.png

The 2 "half mirrors" separated by 1 cm is equivalent to 2 full mirrors whose principal axis' are at a distance of 1 cm from each other , with the object in between as shown in the figure.

From the figure, we can say that the object distance are the same for the 2 mirrors. The only thing different will be the image heights, whose direction will be opposite of each other and the magnitudes will be the same.
Using the mirror formula, we get the images will be formed at a distance 30 cm in front of the mirror and at a height of 2 cm on either sides of the original principle axis.