aberration hard

Question

Spherical aberration minimized using:

RankGuru · Accepted Answer

**Spherical Aberration** occurs because marginal rays (far from the axis) focus at a different point than paraxial rays (near the axis).
Methods to minimize it:
1. Using a **stop** to block marginal rays.
2. Using an **aspheric lens** (specifically shaped surfaces).
3. Using a combination of lenses with opposite aberrations.
- It is a defect of spherical geometry, not chromatic dispersion.

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aberration hard

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