Visual optical system

A visual optical system, comprising:

• a first optical system and a second optical system,
• wherein the first optical system comprises, sequentially along a first optical axis from a first side to a second side, a first lens having a positive refractive power, a reflective polarizing element, a quarter-wave plate, a second lens having a refractive power, and a third lens having a positive refractive power, and
• the second optical system comprises, sequentially along a second optical axis from the first side to the second side,
• a first lens element having a refractive power;
• a second lens element having a refractive power;
• a third lens element having a refractive power;
• a fourth lens element having a refractive power;
• a fifth lens element having a positive refractive power;
• and
• a sixth lens element having a refractive power,
• wherein a number of lens elements in the second optical system is 6, and
• an effective focal length f3′ of the third lens, a distance TD′ from a first-side surface of the first lens to a second-side surface of the third lens on the first optical axis, an effective focal length f1 of the first lens element, and a distance TD from a first-side surface of the first lens element to a second-side surface of the sixth lens element on the second optical axis satisfy:
• 1.9<(f3′/TD′)/(|f1/TD)<5.7.