Optical apparatus, image display apparatus, and display apparatus

Abstract

An optical apparatus into which light emitted from an image forming apparatus enters, in which the light is guided, and from which the light is emitted includes a light guide plate, first deflection means, second deflection means, and third deflection means. The first deflection meansdeflects light incident on the light guide platein such a manner that the light is totally reflected in the light guide plate. The second deflection meansdeflects the light that has propagated in the light guide plateby total reflection in such a manner as to cause the light to be emitted from the light guide plate. The third deflection meansdeflects the light that has been deflected by the first deflection meansand that has propagated in the light guide plateby total reflection toward the second deflection means. An incident angle of the light emitted from a center point of an image forming region of the image forming apparatus on the light guide plate is an angle other than zero degrees, and a unit vector of light emitted from the center point of the image forming region of the image forming apparatus and a unit vector of this light at the time of emission from the light guide plate are opposite in direction.