Image displaying apparatus having plane mirror at conjugate to image displaying element

An image displaying apparatus comprising:

• a light source;
• an image displaying element configured to control exiting of incident light to display an image;
• an illumination optical system configured to illuminate the image displaying element with light exiting from the light source;
• and
• a projection optical system configured to project an image displayed on a display surface of the image displaying element onto a surface to be projected onto, to provide an enlarged display,
• wherein the projection optical system includes a leas optical system, a first mirror configured to reflect light transmitted through the lens optical system, and a second mirror configured to reflect light reflected from the first mirror toward the surface to be projected onto,
• wherein one of the first mirror and the second mirror is arranged so that at least a part of an optical surface of said one of the first mirror and the second mirror is present at a position that is conjugate to the image displaying element,
• wherein the optical surface of the one mirror is arranged to face a vertically downward direction, and wherein light condensation of the light reflected from the second mirror towards the surface to be projected onto is at a position proximate to a contamination barrier and the first mirror.