Class 7 Exam > Class 7 Notes > Formation of convex and concave mirror
Formation of convex and concave mirror - Class 7 PDF Download
Convex and concave diagram how to formed?
Ref: https://edurev.in/question/554708/Convex-and-concave-diagram-how-to-formed-
Image formation by convex lens ray diagrams
Image formation in convex lens can be explained with the help of three principal rays shown in figure.
- The ray parallel to the principal axis passes through the focal point after refraction by the lens.
- The ray passing through optical centre passes straight through the lens and remains undeviated.
- The ray passing through the focal point becomes parallel to the principal axis after refraction by the lens.
Ray diagram for concave lens
Image formation in convex lens
Case 1:When object beyond 2F:
In this case image will form between F and 2F,image will be real,inverted,smaller than the object.
Case 2:When object is placed at 2F:
In this case image will form at 2F,also image will be real ,inverted,the same as the size of the object.
Case 3:When object is placed between F and 2F:
In this case image will form beyond the 2F,also image will be real,inverted,larger than the object.
Case 4:When object is placed at F:
In this case no image will formed because the refracted rays are parallel and never meet.
Case 5:When object is placed between F and optical centre:
In this case image will form behind the object,also image will be virtual,erect,larger than the object.
FAQs on Formation of convex and concave mirror - Class 7
| 1. How is a convex mirror formed? |  |
Ans. A convex mirror is formed by a spherical mirror with its outer surface bulging outwards. The mirror surface is curved outwards, causing parallel rays of light to diverge after reflection.
| 2. How is a concave mirror formed? | |
Ans. A concave mirror is formed by a spherical mirror with its inner surface curved inwards. The mirror surface is curved inwards, causing parallel rays of light to converge after reflection.
| 3. What is the difference between a convex and a concave mirror? | |
Ans. The main difference between a convex and a concave mirror lies in their shape and how they reflect light. A convex mirror bulges outwards and causes light rays to diverge, while a concave mirror curves inwards and causes light rays to converge.
| 4. What are the uses of convex mirrors? | |
Ans. Convex mirrors have several uses, such as in rear-view mirrors of vehicles, as they provide a wider field of view and enable the driver to see objects behind them. They are also used in security mirrors, traffic mirrors, and in some telescopes.
| 5. What are the uses of concave mirrors? | |
Ans. Concave mirrors have various applications. They are used in reflecting telescopes to gather and focus light. They are also used in makeup mirrors to magnify the reflection. Concave mirrors are used in headlights of vehicles to focus the light beam and in dental mirrors for better visibility during dental procedures.
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Jan 06, 2025
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