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Ray Diagrams - Concave and Convex Mirrors - Light - CBSE Class 7 Science Video Lecture

FAQs on Ray Diagrams - Concave and Convex Mirrors - Light - CBSE Class 7 Science Video Lecture

1. What is a concave mirror and how does it work?
Ans. A concave mirror is a mirror with a curved surface that bulges inwards. It works by reflecting light rays towards a focal point. When parallel light rays fall on a concave mirror, they converge after reflection and form a real image.
2. What is a convex mirror and how does it work?
Ans. A convex mirror is a mirror with a curved surface that bulges outwards. It works by reflecting light rays away from a focal point. When parallel light rays fall on a convex mirror, they diverge after reflection and form a virtual image.
3. How can we draw a ray diagram for a concave mirror?
Ans. To draw a ray diagram for a concave mirror, follow these steps: 1. Draw the principal axis, which is a straight line passing through the center of curvature (C) and the vertex (V) of the mirror. 2. Take an incident ray parallel to the principal axis and draw it towards the mirror. 3. From the point where the incident ray hits the mirror, draw a line perpendicular to the mirror's surface. 4. Draw the reflected ray by extending the line from step 3 towards the principal axis. 5. Repeat steps 2-4 for an incident ray passing through the center of curvature and an incident ray passing through the focus. 6. The point where the reflected rays intersect is the location of the image.
4. How can we draw a ray diagram for a convex mirror?
Ans. To draw a ray diagram for a convex mirror, follow these steps: 1. Draw the principal axis, which is a straight line passing through the center of curvature (C) and the vertex (V) of the mirror. 2. Take an incident ray parallel to the principal axis and draw it towards the mirror. 3. From the point where the incident ray hits the mirror, draw a line away from the mirror's surface. 4. Draw the reflected ray by extending the line from step 3 towards the principal axis. 5. Repeat steps 2-4 for an incident ray passing through the center of curvature. 6. The reflected rays appear to diverge from a point behind the mirror, forming a virtual image.
5. What are the differences between a concave mirror and a convex mirror?
Ans. The main differences between a concave mirror and a convex mirror are: 1. Shape: A concave mirror has a curved surface that bulges inwards, while a convex mirror has a curved surface that bulges outwards. 2. Image Formation: A concave mirror forms real and inverted images when the object is placed beyond the center of curvature, while a convex mirror forms virtual and upright images. 3. Focal Point: A concave mirror has a real focal point where the reflected rays converge, while a convex mirror has a virtual focal point from where the reflected rays appear to diverge. 4. Magnification: A concave mirror can produce both magnified and reduced images, depending on the object's position, while a convex mirror always produces reduced images. 5. Field of View: A concave mirror provides a smaller field of view compared to a convex mirror, which provides a wider field of view.
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