Lightfield camera that can simultaneously acquire 2D information and 3D spatial information from same depth

An optical system comprising:

• a polarizer configured to adjust a polarization state of object light scattered from an object to one polarization direction;
• a polarization switching layer disposed at a rear end of the polarizer based on a direction of travel of the object light, and configured to adjust a polarization state of the object light having passed through the polarizer;
• a polarization-dependent concave lens disposed at a rear end of the polarization switching layer based on the direction of travel of the object light, and configured to transmit or disperse light incident on the polarization-dependent concave lens depending on a polarization direction of the light;
• a main lens configured to receive the light having passed through the polarization-dependent concave lens and focus the light to one focal point;
• and
• a polarization micro lens array disposed at a rear end of the polarization-dependent concave lens based on the direction of travel of the object light, and configured to focus or transmit light incident on the polarization micro lens array depending on a polarization direction of the light.