Abstract: An optical system affixed to an electronic apparatus is provided, including a first optical module, a second optical module, and a third optical module. The first optical module is configured to adjust the moving direction of a first light from a first moving direction to a second moving direction, wherein the first moving direction is not parallel to the second moving direction. The second optical module is configured to receive the first light moving in the second moving direction. The first light reaches the third optical module via the first optical module and the second optical module in sequence. The third optical module includes a first photoelectric converter configured to transform the first light into a first image signal.

Abstract: A human negligence warning method based on augmented reality includes steps of: using a smart wearable device to photograph multiple physical operation elements of an electronic apparatus to obtain interface depth data; performing spatial position calculations according to the interface depth data, to set corresponding wrapping geometry elements between the physical operation elements and the smart wearable device to wrap the physical operation elements, respectively; photograph a hand of a wearer wearing the smart wearable device to obtain a gesture and a spatial position of the hand; and judging whether the hand touches one of the wrapping geometry elements according to the gesture and the spatial position, and further judging whether a corresponding procedure to be initiated by the physical operation element is correct if yes, If the corresponding procedure is not correct, then an warning operation is performed to avoid human negligence.