Draw ray diagrams to show focus for a Convex mirror.

Draw ray diagrams to show focus for a concave mirror

Draw ray diagrams to show the principal focus of converging (or convex) lens

Draw ray diagrams to show the principal focus of diverging (or concave) lens.

Draw a ray diagram to show the virtual image formed due to reflection from a concave mirror.

An object is placed at a distance X_1 from the focus of a concave mirror, Its real image is formed at a distance X_2 from the focus, Show that the focal length of the mirror is sqrt(x_1x_2)

Draw a neat, labelled ray diagram to show the formation of virtual image by a concave mirror.