CPC G02B 13/007 (2013.01) [G02B 13/003 (2013.01); G03B 17/17 (2013.01)] | 19 Claims |
1. An optical system, comprising:
in order from an object side of the optical system to an image side of the optical system:
a first lens group comprising a power prism that includes a first surface, a second surface, and a third surface on an optical axis of the optical system, wherein the first surface is a transmissive aspherical surface that provides positive refractive power for the prism, wherein the second surface is a reflective surface that folds the optical axis of the optical system, and wherein the third surface is a transmissive surface; and
a second lens group comprising two or more refractive lenses; and
wherein the optical system satisfies the conditional expressions:
0.6<B/A<2.3,
where A is power of the optical system, and B is power of the first lens group, and
−0.2<CD<0.1,
where C is power of the second lens group, and D is length of the second lens group.
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