Final answer:
While properly adjusted mirrors can reduce blind spots, it's still recommended to perform shoulder checks. Corner reflectors, which use total internal reflection, illustrate the practical application of mirror usage in technology like headlights, binoculars, and periscopes.
Step-by-step explanation:
The statement “When the mirrors are set correctly, there is no need to check blind zones” is not entirely accurate. While setting mirrors correctly in a vehicle can greatly reduce blind zones, it is still considered best practice for drivers to perform a shoulder check to directly observe these areas. In physics, the application of mirrors for directional light and visibility is notable. For instance, corner reflectors utilize the principle of total internal reflection, with a critical angle often less than 45°, to efficiently direct light. These concepts are applied in various technologies such as the creation of a directional beam in vehicle headlights, enhancing sight in binoculars, and providing visibility in periscopes on submarines.