Question

A combination of lenses made of different types of glass which do not produce spherical aberration are called

• A. converging lenses
• B. diverging lenses
• C. anastigmat lenses
• D. none of these

Answer 1

The correct option is C

anastigmat lenses

Explanation

Spherical aberration- When the peripheral components of a lens do not bring light rays into the same focus as the central part, spherical aberration occurs.

1. The lens produces un-sharp images at big apertures, but crisper images at reduced apertures.

Anastigmatic lenses- A photographic lens that is totally corrected for the three principal optical aberrations: spherical aberration, coma, and astigmatism is known as an anastigmat or anastigmatic lens.

Hence, the correct answer is option (C) anastigmatic lenses.