high School⏱ 5 min

Lens Imaging

Real and virtual images of a lens

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Parameters (converging lens)

Focal length f (cm)30

Object distance d₀ (cm)75

\ rac{1}{f} = \ rac{1}{d_o} + \ rac{1}{d_i}

dᵢ = 50.0 cm · magnification = -0.67

• d₀ > f: real, inverted image beyond the lens • d₀ < f: virtual, upright, magnified image (magnifier) • d₀ = 2f: image the same size as the object