CBSE Class 8 > Class 8 Notes > Science Curiosity - New NCERT > Mnemonic: Light: Mirrors and Lenses
Mnemonic: Light: Mirrors and Lenses
Concave vs Convex
Mnemonic : Con-CAVE = CAVES IN
CONVEX = Bulges OUT
- Concave - CAVED INWARDS
- Convex- Curved OUTWARDS
| Optical Device | Object Position | Image Nature | Image Size | Easy Code / Mnemonic |
|---|---|---|---|---|
| Concave Mirror | Close | Erect | Enlarged | EE |
| Far | Inverted | Enlarged | IE | |
| Convex Mirror | Any position | Erect | Diminished | DE |
| Convex Lens | Close | Erect | Enlarged | EE |
| Far | Inverted | (Usually diminished, not always) | ID | |
| Concave Lens | Any position | Erect | Diminished | DE |
Tip - Concave mirror = Convex lens
Convex mirror = Concave mirror (only difference is in far away case of convex it is usually ID not IE )
Concave Mirror Images
Object CLOSE to concave mirror: EE
- Erect (right side up)
- Enlarged (bigger)
Object FAR from concave mirror: IE
- Inverted (upside down)
- Enlarged (bigger)
Convex Mirror Images
"Convex is BORING - Never changes mood!" - DE
- ALWAYS diminished (smaller)
- ALWAYS erect
Convex Lens Images
Object CLOSE : EE
- Erect (right side up)
- Enlarged (bigger)
Object FAR from concave mirror: I
- Inverted (upside down)
Concave Lens Images
Mnemonic : DE
- ALWAYS diminished
- ALWAYS erect
Converge vs Diverge
- Concave mirror = Convex lens = Converge
- Convex mirror = Concave lens = Diverges
Tip - Concave mirror has an extra C as compared to Convex so it Converges
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FAQs on Mnemonic: Light: Mirrors and Lenses
| 1. What is the difference between concave and convex mirrors? |  |
Ans. Concave mirrors are curved inward, resembling a bowl, and can produce real or virtual images depending on the object's distance from the mirror. They typically magnify images. Convex mirrors, on the other hand, are curved outward and always produce virtual images that are smaller than the object, providing a wider field of view.
| 2. What types of images do concave mirrors produce? | |
Ans. Concave mirrors can produce three types of images based on the object's position relative to the mirror's focal point: 1. When the object is beyond the centre of curvature, a real and inverted image is formed. 2. When the object is at the centre of curvature, a real and inverted image of the same size is produced. 3. When the object is between the focal point and the mirror, a virtual and upright image is generated, which is larger than the object.
| 3. How do convex mirrors form images? | |
Ans. Convex mirrors always form virtual images regardless of the object's position. These images are upright, smaller than the object, and appear behind the mirror. This characteristic makes convex mirrors useful for applications such as vehicle side mirrors, as they allow drivers to see a wider area.
| 4. What are the characteristics of images formed by convex lenses? | |
Ans. Convex lenses can form both real and virtual images depending on the object's distance from the lens. When the object is beyond the focal point, a real and inverted image is produced. However, when the object is placed between the lens and its focal point, a virtual and upright image is formed, which is larger than the object.
| 5. How do concave lenses differ in image formation compared to convex lenses? | |
Ans. Concave lenses always produce virtual images that are upright and smaller than the object, regardless of the object's position. This is in contrast to convex lenses, which can produce both real and virtual images depending on where the object is located relative to the lens.
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Apr 22, 2026 Last updated
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