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L10 : Spherical Mirror Terminologies - Light, Science, Class 7 Video Lecture

FAQs on L10 : Spherical Mirror Terminologies - Light, Science, Class 7 Video Lecture

1. What are the different terminologies associated with spherical mirrors?
Ans. The different terminologies associated with spherical mirrors are: 1. Pole: The center point of a spherical mirror is known as the pole. It is denoted by "P". 2. Principal axis: The line passing through the pole and the center of curvature of a spherical mirror is called the principal axis. 3. Focus: The point on the principal axis where the parallel rays of light converge or appear to diverge after reflection is known as the focus. In a concave mirror, the focus is real and lies in front of the mirror, while in a convex mirror, the focus is virtual and lies behind the mirror. 4. Focal length: The distance between the pole and the focus of a spherical mirror is called the focal length. It is denoted by "f". 5. Radius of curvature: The distance between the pole and the center of curvature of a spherical mirror is called the radius of curvature. It is denoted by "R".
2. What is the difference between a concave mirror and a convex mirror?
Ans. The main difference between a concave mirror and a convex mirror is the way they reflect light: 1. Concave mirror: It is a spherical mirror that curves inward or is "caved" in the middle. It converges the parallel rays of light that fall on it after reflection. It forms both real and virtual images, depending on the object's position relative to the mirror. Concave mirrors are commonly used in telescopes, shaving mirrors, and headlights. 2. Convex mirror: It is a spherical mirror that curves outward or bulges in the middle. It diverges the parallel rays of light that fall on it after reflection. It forms only virtual images that are always diminished and upright. Convex mirrors are commonly used in rear-view mirrors of vehicles and in stores to provide a wide field of view.
3. How does a concave mirror form an image?
Ans. A concave mirror forms an image by reflecting and converging the light rays that fall on it. The image formation depends on the position of the object relative to the mirror: 1. When the object is placed beyond the center of curvature (C) of the concave mirror, a real and inverted image is formed between the focus (F) and the center of curvature (C). 2. When the object is placed at the center of curvature (C), a real and inverted image is formed at the center of curvature itself. 3. When the object is placed between the center of curvature (C) and the focus (F), a real and inverted image is formed beyond the center of curvature. 4. When the object is placed at the focus (F), the reflected rays become parallel, and no image is formed. 5. When the object is placed between the focus (F) and the pole (P) of the concave mirror, a virtual and erect image is formed behind the mirror.
4. What is the difference between real and virtual images formed by a concave mirror?
Ans. The difference between real and virtual images formed by a concave mirror is as follows: 1. Real image: It is formed when the light rays actually converge at a point and can be obtained on a screen. Real images are always inverted and can be projected onto a surface. They are formed when the object is placed beyond the center of curvature of the concave mirror. 2. Virtual image: It is formed when the light rays appear to converge at a point but do not actually meet. Virtual images are always erect and cannot be projected onto a surface. They are formed when the object is placed between the focus and the pole of the concave mirror.
5. How does a convex mirror form an image?
Ans. A convex mirror forms an image by reflecting and diverging the light rays that fall on it. The image formation by a convex mirror is different from that of a concave mirror: 1. Regardless of the object's position, a convex mirror always forms a virtual, erect, and diminished image. 2. The image appears to be formed behind the mirror, but it cannot be projected onto a screen. 3. The size of the image is smaller than the size of the object. 4. The reflected rays appear to diverge from the virtual focus (F) behind the mirror. 5. The image formed by a convex mirror provides a wider field of view, making it suitable for use in rear-view mirrors of vehicles and in stores for surveillance.
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