Question

Please solve these questions:
Q1. Why is it more convenient/easier to see Sun properly through a pinhole?
Q2. When we observe the movement of a moving spinner or wheels of a moving vehicle, its movement seems to be opposite in direction, as compared to the exact motion. Why?

These questions are related to the concept of 'light' in Science.

Please answer these 2 questions properly and appropriate. Only 2 questions to answer.

You can ask me for extra details, if you need to answer the questions.

Answer 1

In the case of a video camera, or in real life with strobed lighting, the periods of visibility broken by periods of invisibility will interact with frequency of the rotation of the wheel. This so-called Wagon Wheel Effect can, but does not always, produce the illusion that a car’s wheel (or other object) is stationary, or even rotating in the wrong direction .Essentially, the brain seems to create explanations for ambiguous input, applying some reasonable physical understanding to input that might not have an obvious meaning. One study found that two identical rotating wheels can be seen as rotating in opposite directions even when displayed side by side — those they are exactly the same, the brain might latch on to one explanation for one, and another for the other.