physics / Light / free
Geometric Optics
Trace rays through a thin lens to predict where images form.
Follow the mechanism1 / 3
Rays leave the object. Principal rays from the object tip head toward a thin lens with a set focal length.
thin-lens image formation1/f = 1/dₒ + 1/dᵢ
The sign convention is compressed into the real/virtual label. The thin-lens model assumes paraxial rays and ignores aberrations.
image distance38.9 cm
magnification-0.56×
image typereal
The principal rays meet on the far side of the lens, so a screen could catch the inverted image.
04 / PRACTICE
0 / 3 checkedMake the idea yours.
Use the model, then answer without looking back. Each check isolates one decision a learner should be able to make after this lesson.
CHECK 1 / 3