Table of Contents
Activity 11.8- Image Formation with a Convex Mirror
Objective- To observe how a convex mirror forms images of an object, in this case, a candle flame, and to understand the characteristics of these images.
Materials Needed-
- A convex mirror (a mirror that curves outward).
- A candle.
- Matches or a lighter.
Procedure-
- Light the Candle- Place the candle on a table and light it. Ensure it’s in a safe place away from flammable materials.
- Position the Mirror– Place the convex mirror so that it faces the candle.
- Observe the Image- Look at the image of the candle flame in the convex mirror. Notice its size, orientation, and how it changes as you move the candle closer or further from the mirror.
Also Check – Class 7 Science -Chapter 15 – Light- Complete Notes
Also Check – Chapter 11- A Detailed Guide to the Light Activities for Class 7 Students
Core Concepts Explained-
- Convex Mirrors- These mirrors bulge outward and reflect light in a way that makes the light rays diverge (spread out).
- Virtual Images-
- Convex mirrors always form virtual images. These images seem to be behind the mirror and can’t be projected onto a screen.
- The images are erect (upright) and smaller than the actual object, no matter how far or close the object is to the mirror.
Also Check – Difference Between a Convex and Concave Lens
Possible Questions and Answers-
Why does the convex mirror always make things look smaller?
- Due to its shape, a convex mirror spreads out (diverges) the light rays. This spreading out makes the image look smaller than the actual object.
Also Check – Convex Lenses- Principles, Applications, and Insights
Can the convex mirror ever make a real image?
- No, convex mirrors always form virtual images. The way they reflect light doesn’t allow for the rays to converge at a point to create a real image.
Why is the image always upright?
- The nature of the light reflection in a convex mirror ensures that the image remains erect. It does not invert the image like a concave mirror.
What would happen if I move the candle closer or further away?
- The image will always remain smaller and upright. However, as you move the candle closer to the mirror, the image will get slightly larger, and as you move it away, the image gets smaller.
Why can’t we project the image on a screen?
- Since the image is virtual (not real), it’s not formed by the actual convergence of light rays in front of the mirror. Hence, it can’t be projected onto a screen.
