optics - How does a diverging lens in a Galilean telescope form an image at infinity when its object is at its focal plane? - Physics Stack Exchange
Concave lens – Object at different distances from the lens
We know that a concave lens always forms a virtual and diminished image, then we use this lens in myopic eye, then we must be able to see the image is diminished,
Why does a concave lens always form a virtual image of an object Draw a diagram to illustrate this
66.From ray diagram show the (1) image formation by concave lens for the object at focus. (2) image formation by concave lens for the virtual object at focus