All-About-Light-Amazing-Physics-Around-Us.pptx

light

1. All About Light: Amazing Physics Around Us! Light travels at 299,792 km/s in a vacuum. It is vital for sight, photosynthesis, and modern technology. Light behaves both like waves and particles (photons), revealing its fascinating dual nature. by pavan Thambanda

2. What is Light? The Scientific Definition Light is electromagnetic radiation detectable by our eyes. It usually travels in straight lines unless interrupted. The visible spectrum ranges from 400 to 700 nanometers. These wavelengths correspond to colors from violet to red.

3. Reflection: Mirror, Mirror on the Wall! Reflection Explained Light bounces off surfaces, changing direction. The Law The angle of incidence equals the angle of reflection. Example Calm water produces sharp reflections; rough water scatters light.

4. Refraction: Light’s Amazing Bending Trick! Refraction bends light at boundaries between materials like air and water. This bending causes objects in water to look shifted or broken. The effect is vital for lenses in glasses and cameras.

5. Real Life Examples: Reflection and Refraction in Action Mirrors and sunglasses use reflection to control light. Lenses bend light for cameras, glasses, and eyes through refraction. Rainbows form from sunlight refracted then reflected in raindrops. They display the full visible spectrum in colorful arcs.

6. Laws You Need to Know! Reflection Law Angle in equals angle out; light bounces predictably. Snell's Law (Refraction) n₁sinθ₁ = n₂sinθ₂ governs bending of light between media. Applications These laws underpin optics and many technologies.

7. Fun With Scattering! Light Scattering Light spreads when it hits tiny particles in the atmosphere. 1 Blue Sky Short blue waves scatter more, making the sky appear blue. 2 Sunsets Longer path scatters blue light away more, leaving red/orange hues. 3

8. Who Figured This All Out? The Founders Isaac Newton Light as particles and prism experiments revealing color. Christiaan Huygens Wave theory of light explaining its spreading behavior. Ibn al-Haytham “Father of Optics,” explained reflection and refraction scientifically.

9. Cool and Weird Light Facts Speed of Light Sunlight takes 8 minutes to reach Earth. Animal Vision Cats and animals detect more color shades than humans. Bioluminescence Some creatures create their own light underwater.

10. Wrap-Up: Why Light is Magic! Daily Use Light powers vision, technology, art, and science. Innovations Lasers, fiber optics, cameras, and solar panels rely on light. Stay Curious Observe and explore physics all around you.