Optical Element
Focal Length
Convex lens: f positive
Object
Display
Legend
━━ Ray 1: parallel → focal
━━ Ray 2: through centre
━━ Ray 3: through focal → parallel
- - - Virtual rays
Thin Lens / Mirror Equations
1/v + 1/u = 1/f
Magnification m = -v/u
Image distance v
Image height h'
Image type