Lens Maker's Formula Explorer

Focal length from refractive index · ch09-ray-optics-and-optical-instruments

Vary the refractive index n of a symmetric biconvex lens (|R| = 20 cm) and see how the focal length changes.

Controls

|R| of both surfaces (cm)20 cm

refractive index n1.50

Live values

f = \frac{R}{2(n-1)}

Try this: x represents refractive index n. As n increases, f decreases (stronger lens).

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