Unraveling the Rainbow's Mystery: Why it's Semicircular, Not Square!

• Rainbows form when sunlight passes through raindrops, which act as small prisms, causing light to refract and reflect.
• The semicircular shape is due to light reaching our eyes at a specific 40-42 degree angle, with the Earth's horizon blocking the lower half.
• A rainbow is actually a complete circle, visible as such from high altitudes like planes or mountains.
• It's an optical illusion, not a physical object; its apparent movement is due to changing viewing angles.
• Rainbows are rarely seen at noon because the sun is directly overhead, causing the 42-degree angle to form below the ground.