🌈 Why Can You See a Rainbow?

Have you ever wondered why rainbows form perfect arcs after a storm? Or how your phone's camera focuses light to capture a photo? Or why fiber optic cables can send internet signals thousands of miles without losing data?

The answer lies in how light behaves.

When light travels through different materials — air, water, glass, diamond — it doesn't just pass through unchanged. It bends, bounces, and splits into colors.

Understanding these behaviors unlocks the secrets behind:

• 📸 Every camera lens and telescope
• 💎 Why diamonds sparkle
• 🌐 The entire internet (fiber optics!)
• 👓 Prescription glasses and contacts
• 🌈 Rainbows and natural phenomena

In this lesson, you'll master the physics that powers our modern visual world.