Class 7 Exam > Class 7 Videos > Science Class 7 > Uses of Concave Mirror
Uses of Concave Mirror Video Lecture | Science Class 7
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FAQs on Uses of Concave Mirror Video Lecture - Science Class 7
| 1. What is a concave mirror and how is it different from a convex mirror? |  |
A concave mirror is a curved mirror that has a reflecting surface that curves inward. It is different from a convex mirror, which has a reflecting surface that curves outward. The shape of the concave mirror causes light rays that strike it parallel to its principal axis to converge and meet at a focal point in front of the mirror, whereas a convex mirror causes the light rays to diverge.
| 2. What are the uses of a concave mirror? | |
Concave mirrors have several practical applications. One common use is in optical devices such as telescopes and microscopes, where they are used to gather and focus light. They are also used in headlights of cars to produce a strong beam of light. Concave mirrors are also used in shaving mirrors and makeup mirrors to magnify the reflection and provide a clearer view. Additionally, they are used in solar power plants to concentrate sunlight onto a small area for generating heat or electricity.
| 3. How does a concave mirror form an image? | |
When an object is placed in front of a concave mirror, the mirror reflects the light rays that strike it. The shape of the mirror causes the rays to converge and meet at a point called the focal point. The image formed by a concave mirror can be real or virtual, depending on the position of the object relative to the mirror. If the object is placed beyond the focal point, a real inverted image is formed. If the object is placed between the focal point and the mirror, a virtual upright image is formed.
| 4. Can a concave mirror be used to see a larger image of an object? | |
Yes, a concave mirror can be used to see a larger image of an object. When an object is placed between the focal point and the mirror, a virtual upright image is formed that appears larger than the actual object. This is commonly observed in makeup mirrors and shaving mirrors, where the concave shape of the mirror magnifies the reflection and provides a clearer and larger view of the face.
| 5. How does a concave mirror contribute to solar power generation? | |
Concave mirrors are used in solar power plants to concentrate sunlight onto a small area. The mirror's shape helps focus the sunlight and direct it onto a receiver, such as a pipe containing a fluid or a photovoltaic cell. By concentrating the sunlight, the concave mirror increases the intensity of the light, which can then be used to generate heat or electricity. This allows for more efficient solar power generation and makes it possible to harness the sun's energy for various applications.
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Dec 18, 2024 Last updated |
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