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Introduction - Light Video Lecture - Class 8
FAQs on Introduction - Light Video Lecture - Class 8
| 1. What is light? |  |
Ans. Light is a form of electromagnetic radiation that is visible to the human eye. It is composed of particles called photons that travel in waves and carry energy.
| 2. How does light travel? | |
Ans. Light travels in straight lines called rays. It can travel through empty space or through different mediums such as air, water, or glass. When light encounters a different medium, it may change direction, speed, or both, in a process called refraction.
| 3. What are the properties of light? | |
Ans. Light has several properties, including reflection, refraction, dispersion, and diffraction. Reflection is when light bounces off a surface, while refraction is the bending of light as it passes through different mediums. Dispersion refers to the separation of light into its component colors, and diffraction is the bending of light around obstacles.
| 4. How is light produced? | |
Ans. Light can be produced in various ways. One common way is through incandescence, where an object becomes hot and emits light. Another method is luminescence, which involves the emission of light by certain materials when they are excited. Examples of luminescent sources include fluorescent lights and LEDs.
| 5. How does light interact with objects? | |
Ans. When light interacts with objects, it can be absorbed, transmitted, or reflected. Absorption occurs when an object absorbs the light energy, converting it into other forms of energy such as heat. Transmission happens when light passes through the object without being absorbed. Reflection is when light bounces off the surface of an object, allowing us to see it.
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