Folded optics

Folded optics refers to a design technique in optical systems where light paths are altered using reflective surfaces to "fold" the optical path. This is commonly achieved using mirrors, prisms, or other optical components that redirect light, allowing for more compact designs and enabling various applications in optical devices. This technique is particularly useful in several areas: 1. **Compact Design**: By folding the optical path, systems can fit into smaller spaces while maintaining the necessary optical performance.