In optics, a real image and a virtual image refer to the types of images formed by optical systems, such as lenses or mirrors. Here's an explanation of each type along with examples:
- Real Image: A real image is formed when light rays actually converge at a specific point, allowing the image to be projected onto a screen or surface. It is formed by the actual intersection of light rays and can be captured on a physical surface. Real images are formed by convex lenses or concave mirrors when the object is placed at a certain distance from the optical device.
Example: When you hold a convex lens under sunlight and place a piece of paper at a specific distance from the lens, an inverted image of the sun can be formed on the paper. This image can be projected onto the paper and can be captured on a screen.
- Virtual Image: A virtual image is formed by the apparent intersection of light rays. It appears to be located at a position where the light rays appear to originate, but they do not actually converge at that point. Virtual images cannot be projected onto a screen or captured on a surface since they do not involve the convergence of light rays.
Example: When you look into a flat mirror, you see a virtual image of yourself. The image appears behind the mirror, but in reality, the light rays reflected from your body do not converge at the position where the image appears. This virtual image is formed by the apparent extension of the reflected rays.
In summary, a real image is formed by the actual convergence of light rays and can be projected onto a screen, while a virtual image is formed by the apparent extension of light rays and cannot be projected or captured on a surface.