Loading…

Civil Engineering MCQ practice, mock tests and performance analysis for SSC JE, RRB JE, GATE, ESE and State AE/JE exams.

Exams

Practice

Civexa

The absence of spherical aberration in a telescope is called — Answer & Solution | Civexa

Surveying · Theodolite

Theodolite MCQ with answer and solution

Easy level · Asked in State AE, State JE, GPSC AE

The absence of spherical aberration in a telescope is called

Solution

Concept

Aberrations in lenses

Step-by-step solution

1. Absence of spherical aberration is called aplanation. 2. Absence of chromatic aberration is called achromatism.

Explanation

An aplanatic lens is one that is free from spherical aberration. An achromatic lens is free from chromatic aberration.

Shortcut

Aplanatic = spherical aberration corrected; Achromatic = colour corrected.

Common mistake

Choosing achromation.

Correct answer: C) Aplanation

Practise more Theodolite questions

Free account: timed tests with your exam's negative marking, previous-year papers, a mistake book and weak-topic analysis.

A theodolite is called a transit theodolite, when its telescope can be revolved through a complete revolution about its
If the smallest division of a Vernier is longer than the smallest division of its primary scale, then the Vernier is called
A 10 cm theodolite means that
Spire test is used for the adjustment of
A telescope is said to be inverted if its
An angle measuring instrument reading up to one-sixth of a degree on the main scale is equipped with a Vernier having 19 main…