With the aid of a sketch ray diagram explain spherical aberration in concave lenses and state how it is minimized.

With the aid of a sketch ray diagram explain spherical aberration in concave lenses and state how it is minimized.

Spherical aberration in concave lens occurs when parallel marginal light rays to the lens after refraction appear to diverge from different points from that of paraxial rays.

Means of reduction of spherical aberration

• Using lenses with an aspheric surface
• By using combination of lenses of opposite nature (convex & concave) of different materials.
• Using lens of small aperture
• Using a stopper to block refraction marginal light rays

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