| CPC F21V 5/00 (2013.01) [F21V 19/003 (2013.01); G01B 11/24 (2013.01); F21Y 2115/10 (2016.08)] | 15 Claims |

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1. A method of designing an optical system including a dome light and a coaxial light, the method comprising:
determining a distance between the dome light and the coaxial light based on a radius reduction according to a hole of the dome light;
determining a size of the coaxial light based on an optical path of a light ray emitted from the coaxial light; and
determining a structure of a printed circuit board (PCB) in the dome light based on an optical path through which the light ray emitted from the coaxial light is reflected by an object.
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