Two identical concave mirrors each of focal length \( f \) are facing each other as shown in the schematic diagram. The focal length \( f \) is much larger than the size of the mirrors. A glass slab of thickness \( t \) and refractive index \( n_{0} \) is kept equidistant from the mirrors and perpendicular to their common principal axis. A monochromatic point light source \( S \) is embedded at the center of the slab on the principal axis, as shown in the schematic diagram. For the image to be formed on \( S \) itself, which of the following distance between the two mirrors is/are correct:
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