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Light (Class 11, CBSE) Video Lecture

FAQs on Light (Class 11, CBSE) Video Lecture

1. What is light and how does it behave as a wave and a particle?
Ans. Light is a form of electromagnetic radiation that is visible to the human eye. It can behave both as a wave and a particle, known as a wave-particle duality. As a wave, light exhibits properties like diffraction and interference. As a particle, light is made up of discrete packets of energy called photons.
2. How does light travel through different mediums?
Ans. Light can travel through different mediums such as air, water, and glass. When light enters a medium, it interacts with the atoms or molecules of that medium. This interaction causes the light to slow down and change direction, a phenomenon known as refraction. The extent of refraction depends on the density and refractive index of the medium.
3. What is the speed of light and why is it considered the fastest thing in the universe?
Ans. The speed of light in a vacuum is approximately 299,792,458 meters per second. It is considered the fastest thing in the universe because nothing can surpass or equal its speed. This is due to the fundamental nature of light, which is governed by the laws of physics. According to Einstein's theory of relativity, the speed of light is an absolute constant and acts as a cosmic speed limit.
4. Can light be polarized and what is its significance?
Ans. Yes, light can be polarized. Polarization refers to the orientation of the electric field vector of light waves. When light waves are polarized, their electric field vectors vibrate in a specific direction. Polarized light has various applications in areas such as sunglasses, LCD screens, and optical filters. It allows for the selective transmission or blocking of light waves based on their polarization.
5. How does light interact with matter to produce colors?
Ans. Light interacts with matter through a process called absorption and emission. When white light, which contains all colors of the visible spectrum, strikes an object, certain colors are absorbed by the object's atoms or molecules while others are reflected or transmitted. The colors that are reflected or transmitted are the ones we perceive as the object's color. This interaction of light with matter gives rise to the wide range of colors we see in the world around us.
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