How does a concave lens form an image?
The image is formed as shown, where the two rays meet, between F and the lens. The image formed is virtual as we see that the light appears to pass through the focus behind the lens. Hence, the image formed by a concave lens is always erect and virtual
How do lenses and mirrors form images?
A system of lenses and/or mirrors forms an image by gathering rays from an object and then causes them to converge or diverge. A real image is formed when the optical system causes the rays to converge to a point, a virtual image is formed at the location from which they seem to originate.
What lens forms real images?
1) A convex lens always gives a real image.
