Final answer:
By law, a clear windshield is required for driving, involving principles of light refraction and vision. Nearsighted individuals may need corrective lenses to achieve clear vision at the standard distance, and foveal vision explains the sharpness at the center of our gaze. The claim of being blinded by the moon is unlikely to be valid.
Step-by-step explanation:
By law, you must be able to see clearly through the windshield. The statement that is true regarding this topic is that the windshield must be free of obstruction and provide a clear view of the road. This involves various physical principles of light and vision to ensure safety while driving. For example, headlights on your car must be properly aimed and maintained to illuminate the road ahead without blinding oncoming traffic.
When light travels from air into water, as stated in The Law of Refraction, the light bends due to a change in speed. This bending of light is what enables clear vision through the windshield even in rainy conditions, assuming the windshield wipers are functioning properly. Similarly, when a light ray travels from air into glass, like that of a car's windshield, it also bends. The material and curvature of the windshield are designed so that light is refracted minimally, maintaining clear vision.
For a nearsighted man who cannot see objects clearly beyond 20 cm, he must stand half the distance between his eyes and the mirror, which would be 10 cm away, in order to see his reflection clearly when shaving. This is due to the physics of light and mirror reflections, where the image distance (di) must be equal to the lens-to-retina distance to obtain clear vision. Therefore, to achieve normal vision for objects at a distance (do) of 25 cm to infinity, corrective measures such as glasses or contact lenses may be needed for a nearsighted individual.
Additionally, sensitivity of foveal vision demonstrates the sharpness and clarity at the center point of one's gaze. If you look at the letter 'G' in the word 'ROGERS', the letters on either side may appear less clear, exemplifying the foveal vision's focus on detail straight ahead.
In the case of a car accident near midnight on a full moon, it is unlikely that the Moon's brightness could cause significant enough glare to blind a driver momentarily, as the moon's light is generally not intense enough to result in such a situation.