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Optics

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Optics

Paraxial Approximation

A small-angle approximation in geometric optics assuming light rays make small angles $θ$ with the optical axis.

sin θ ≈ θ, tan θ ≈ θ, cos θ ≈ 1 rad (radians) Optics

Polarization

The property of transverse electromagnetic waves specifying the geometric orientation of their electric field vector oscillations in space.

E(z,t) = E0 cos(k z - ω t) i_hat N/A Optics

Presbyopia

The age-related loss of accommodation power in the human eye caused by reduced elasticity of the crystalline lens.

Near Point > 25 cm (increases with age) Diopters (D)