Abstract: An optical system applied to an optical biometer is disclosed. The optical system includes a light source, first and second switchable reflectors, and first and second fixed reflectors. The first switchable reflector is disposed corresponding to the light source. The second switchable reflector is disposed corresponding to an eye. In a first mode, the first and second switchable reflectors are switched to a first state, and the incident light emitted by the light source is reflected by the first fixed reflector along a first optical path and then emitted to a first position of the eye. In a second mode, the first and second switchable reflectors are switched to a second state, and the incident light is sequentially reflected by the first switchable reflector, the second fixed reflector and the second switchable reflector along a second optical path and then emitted to a second position of the eye.

Abstract: An automatically watered flowerpot comprises a vessel of the flowerpot with an upward opening, and a stop board or an interior basin set in the vessel to form a first receiving room and a second receiving room; potted plants are put in-the first receiving room and water is stored in the second receiving room. At least one water intake pipe and one water spraying pipe are set inside the vessel; the water intake pipe stretches from the first receiving room to the second receiving room, and water can be filled into the second receiving room. A water drawing machine is connected to the water spraying pipe in the second receiving room and controlled by the controller to draw water for a fixed amount at a fixed time. Water is sprayed to the first receiving room by the water spraying pipe to prevent the plants from drying up.