| 摘要 |
An optical system according to an embodiment comprises a first lens, a second lens, a third lens, and a fourth lens arranged upward from an object in order and satisfies an equation 1 and an equation 2. [Equation 1: ¦Sag 2¦ < 0] Herein, the Sag2 is the Sag value of the image side on the first lens. [Equation 2: ¦Sag 3¦ < 0.1] Herein, the Sag3 is the Sag value of the object side on the second lens. |
