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What is a Prism and its Types? Video Lecture - Class 8
FAQs on What is a Prism and its Types? Video Lecture - Class 8
| 1. What is a prism and how does it work? |  |
Ans. A prism is a transparent optical element with flat, polished surfaces that refract light. It works by bending or refracting light as it passes through the prism, separating it into its constituent colors. This phenomenon is known as dispersion.
| 2. What are the different types of prisms? | |
Ans. There are several types of prisms, including:
- Triangular prism: This is the most common type of prism and has two triangular bases and three rectangular faces.
- Rectangular prism: It has rectangular bases and faces, making it look like a rectangular box.
- Pentagonal prism: It has two pentagonal bases and five rectangular faces connecting them.
- Hexagonal prism: It has two hexagonal bases and six rectangular faces connecting them.
- Pyramidal prism: It has a polygonal base and triangular faces converging into a vertex.
| 3. What are prisms used for in everyday life? | |
Ans. Prisms have various applications in everyday life, including:
- In optical devices like cameras, binoculars, and telescopes to bend and redirect light for better imaging.
- In spectacles and eyeglasses to correct vision problems like nearsightedness or farsightedness.
- In projectors to split light beams and create vibrant colors on screens.
- In kaleidoscopes to create beautiful patterns by reflecting and refracting light.
- In rainbows, where water droplets act as prisms and refract sunlight to form the colorful arc.
| 4. How do prisms create rainbows? | |
Ans. Prisms create rainbows by refracting and dispersing sunlight. When sunlight passes through water droplets in the air, the droplets act as tiny prisms. The light rays are refracted and dispersed inside the droplets, separating into its constituent colors. This dispersion causes the formation of a circular arc of colors, known as a rainbow.
| 5. Can prisms be used to split white light into colors? | |
Ans. Yes, prisms can split white light into colors. When white light enters a prism, it undergoes dispersion, which means that the different wavelengths of light (corresponding to different colors) are refracted at different angles. As a result, the white light is separated into its constituent colors, creating a spectrum of colors. This phenomenon can be observed when sunlight passes through a prism, producing a rainbow-like pattern called a spectrum.
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Sep 23, 2025
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