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Waves & Optics · geometric optics

Thin Lens and Mirror Equation

Relates focal length to object and image distances for an ideal thin lens or spherical mirror.

1/f = 1/d₀ + 1/dᵢ

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Variables

f
focal lengthm
d₀
object distancem
dᵢ
image distancem

Conditions / notes

Uses the applicable sign convention and ideal paraxial approximation.

Reference details

Subject
Waves & Optics
Topic
geometric optics
Plain text
1/f = 1/d0 + 1/di

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