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Image Formation by Concave Lens Video Lecture | Science Class 7 (Old NCERT)
FAQs on Image Formation by Concave Lens Video Lecture - Science Class 7 (Old NCERT)
| 1. What is a concave lens and how does it form images? |  |
Ans. A concave lens is a lens that is thicker at the edges and thinner in the middle. When light rays pass through a concave lens, they diverge or spread out. The image formed by a concave lens is virtual, erect, and smaller in size than the object.
| 2. Can a concave lens form a real image? | |
Ans. No, a concave lens cannot form a real image. The image formed by a concave lens is always virtual, which means it cannot be obtained on a screen. It can only be seen when looking through the lens.
| 3. How does the distance of the object affect the image formed by a concave lens? | |
Ans. The distance of the object from the concave lens affects the size and position of the image formed. If the object is placed beyond the focal point of the lens, a smaller and inverted image is formed. If the object is placed between the lens and its focal point, a magnified and inverted image is formed.
| 4. Can a concave lens be used to correct nearsightedness? | |
Ans. Yes, a concave lens can be used to correct nearsightedness. Nearsightedness occurs when the eye focuses light in front of the retina instead of on it, resulting in blurred distance vision. By wearing concave lenses, the light entering the eye is diverged, allowing it to focus correctly on the retina and improving distance vision.
| 5. What are some practical applications of concave lenses? | |
Ans. Concave lenses have various practical applications. They are used in eyeglasses to correct nearsightedness, in cameras to capture wide-angle shots, in telescopes to allow for a larger field of view, and in projectors to enlarge and display images on screens or walls.
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