Optics
2 terms
Virtual Image
Optics
m
An optical image formed where light rays appear to diverge from, but do not actually intersect; cannot be projected on a screen.
v < 0 (for virtual image), m > 0 (upright)
Visual Angle
Optics
rad (or arcminutes ')
The angle subtended at the eye's nodal point by an object, determining the size of the image formed on the retina.
θ ≈ h / d (in radians for small angles)