A real image is an image formed by the actual convergence of light rays. It can be captured on a screen or surface and is usually inverted compared to the object's position.
Real images are formed by thin lenses through the process of refraction. When light passes through a thin lens, it is bent and converges at a point to form an image.
The postulation of real images and thin lenses is based on the principle that light rays passing through a thin lens are refracted and converge at a focal point. This focal point is where the real image is formed.
The formation of real images by thin lenses is affected by factors such as the curvature and thickness of the lens, the distance between the lens and the object, and the refractive index of the lens material.
Real images and thin lenses have various practical applications such as in cameras, microscopes, and telescopes. They can also be used in eyeglasses and contact lenses to correct vision problems caused by refractive errors.