| 摘要 |
Development eyeglasses are provided to reduce a manufacturing cost of an electronic product by minimizing a monitor. A convex lens is used for concentrating a parallel beam on one point. A focal distance of the convex lens corresponds to a length between the convex lens and a focus. When the light penetrates the convex lens in the distance corresponding to the focal distance of the convex lens, the light is converted to the parallel beam. When the parallel beam penetrates a concave lens, the parallel beam disperses in all directions. When the light penetrates a focus of the concave lens, the light is converted to the parallel beam.
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