Lens Laboratory

Drag the orange object arrow or use the sliders. Toggle each principal ray. Slide the screen to catch a real image.

Lens type

Object distance (u)30.0 cm

Focal length (|f|)15.0 cm

Object height (h)5.0 cm

Principal raysParallel → through F₂Through F₁ → parallelThrough optical centre

Screen projection

Live readings

u (object dist.)

-30.00 cm

f (focal length)

15.00 cm

v (image dist.)

30.00 cm

m (magnification)

-1.000

Image height h′

-5.00 cm

Nature

real

Orientation

inverted

Size

same

Position

At 2F₁

Real-world analogue: Terrestrial telescope (equal-size relay)

Lens formula

\[ \frac{1}{v} - \frac{1}{u} = \frac{1}{f} \]\[ \frac{1}{v} = \frac{1}{(15.00)} + \frac{1}{(-30.00)} \]\[ v = 30.00 \text{ cm} \qquad m = \frac{v}{u} = -1.000 \]

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