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Compare annual cost and plastic waste between daily disposable and monthly reusable contact lenses, including solution expenses.
Calculate the focal length of a lens using the lens maker's formula based on radii of curvature and refractive index.
Compare the long-term cost of renting a camera lens to buying and reselling it.
Compute the relative arrival time between multiple images of a point-mass gravitational lens using the full Fermat potential.
Calculate recommended contact lens diameter and base curve based on eye measurements, corneal curvature, and vision prescription for optimal lens fitting.
Calculate image distance and magnification using the thin lens formula and object height.