We can see a real image by projecting it onto a screen or sensor. This is because a real image is formed by the actual convergence of light rays.
To elaborate:
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Real Image Formation: A real image is formed when light rays emanating from an object converge at a specific point in space.
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Converging Optics: This convergence is typically achieved using:
- Converging Lens (Convex Lens): A convex lens refracts light rays, causing them to bend inward and converge.
- Concave Mirror: A concave mirror reflects light rays, also causing them to converge.
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Projection onto a Screen: Because the light rays physically converge to form the image, we can place a screen (like a piece of paper, a wall, or a camera sensor) at the point of convergence. The light then scatters off the screen, allowing our eyes to perceive the image. This is how projectors and cameras work.
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Examples:
- A camera uses a lens to form a real image of a scene onto its image sensor.
- A projector uses a lens to project a real image of a slide or video onto a screen.
- The image formed by a concave mirror can be projected onto a surface.
In contrast, a virtual image is formed where light rays appear to originate from, but do not actually converge. Virtual images cannot be projected onto a screen; you can only see them by looking through the lens or mirror. Examples of virtual images are the image you see in a flat mirror, or the image formed by a diverging lens (concave lens).
