Question

Foggy road conditions can make it nearly impossible to see ______ ft. in front of you

Answer 1

A nearsighted man must stand 10 cm from the mirror to see clearly when shaving, because the effective distance to his image in the mirror is twice the actual distance to the mirror.

Step-by-step explanation:

The question 'How close must a nearsighted man stand to a mirror in order to see what he is doing when he shaves, if he cannot see objects clearly beyond 20 cm from his eyes?' pertains to the principles of optics, which is a branch of Physics. When a nearsighted person looks into a mirror, the image they see is effectively the distance from their eyes to the mirror, plus the distance from the mirror to the image formed behind it. Therefore, if a nearsighted man can see clearly up to 20 cm, he needs to stand just half that distance away from the mirror, which is 10 cm. This is because the distance to the mirror image is twice the distance to the mirror itself for flat mirrors.

Answer 2

The international definition of fog is a visibility of less than 1 kilometre (3,300 ft); mist is a visibility of between 1 kilometre (0.62 mi) and 2 kilometres (1.2 mi) and haze from 2 kilometres (1.2 mi) to 5 kilometres (3.1 mi). Fog and mist are generally assumed to be composed principally of water droplets, haze and smoke can be of smaller particle size.