<p>A dual focal length optical system (100) includes a first optical system (200) and a second optical system (300). The first optical system (200) is positioned along an optical axis (125) and includes an optical structure (205) having an object side surface and an image side surface. The object side surface and the image side surface include a refractive surface (140,240) and a reflective surface (225,235). The first optical system (200) has a focal length. The second optical system is positioned on the same optical axis (125) and has a focal length. The focal length of the first optical system is longer than that of the second optical system.</p>
