A virtual image is a non-physical image that is formed by the apparent intersection of reflected or refracted light rays. It is not an actual image, but rather an optical illusion that appears to be located behind a mirror or lens.
A virtual image is formed when light rays from an object are reflected or refracted by a mirror or lens and appear to originate from a point behind the mirror or lens. These light rays do not actually converge at the location of the virtual image, but the brain perceives them as if they do.
A real image is formed when light rays from an object actually converge at a point, creating an image that can be projected onto a surface. A virtual image, on the other hand, is formed by the apparent intersection of light rays and cannot be projected onto a surface.
To measure a virtual image using mirror optics, you can use the law of reflection, which states that the angle of incidence (incoming light ray) is equal to the angle of reflection (outgoing light ray). By measuring the angle of incidence and the distance from the object to the mirror, you can calculate the location of the virtual image.
Virtual images have many practical applications, including the use of mirrors in makeup and dressing rooms, rearview mirrors in cars, and virtual reality technology. They are also used in optical instruments such as telescopes and microscopes to view distant or magnified objects without physically moving them.