How do one-way lenses work and what are their practical applications?

One-way lenses work by allowing light to pass through in one direction while blocking it in the other. This is achieved through a special coating or structure that selectively transmits light based on its angle of incidence.

Practical applications of one-way lenses include security cameras, privacy filters for computer screens, and optical devices like laser systems and microscopes. They are also used in automotive rearview mirrors to reduce glare from headlights at night.