Optical system and imaging apparatus including optical system

An optical system, comprising:

• a first optical element including a first reflective area having a convex shape toward a magnification side;
• a second optical element including a second reflective area having a convex shape toward the magnification side;
• and
• a light shielding member disposed between the first optical element and the second optical element;
• and
• a holding member holding the light shielding member,
• wherein light from the magnification side travels to a reduction side through the second reflective area, the first reflective area, and a refractive area of the second optical element in order,
• wherein light from the refractive area forms an image on only one side of an optical axis in a first cross-section including the optical axis,
• wherein the light shielding member is disposed between light entering the second reflective area and light entering the first reflective area in the first cross-section, and
• wherein the holding member contacts a non-effective area on a reduction-side surface of the first optical element and a non-effective area on a magnification-side surface of the second optical element.