Question: Show that the deviation angle d for a ray striking a thin converging lens at a distance d from the principal axis is given by

Show that the deviation angle d for a ray striking a thin converging lens at a distance d from the principal axis is given by δ = d / f. Therefore, a ray is bent through an angle d that is proportional to d and does not depend on the angle of the incident ray (as long as it is paraxial).

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