Ray Optics: Night Vision Telescope — Image Type MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Night Vision Telescope — Image TypeMediumQuestion 20261

Question

An astronomical telescope forms an inverted image. To make it erect, one needs:

A
An additional erecting lens or a prism system
Correct
B
A concave eyepiece
C
A larger objective
D
No modification — astronomical image is already erect

Correct answer

An additional erecting lens or a prism system

Explanation

Astronomical telescopes give inverted images (acceptable for stars). Terrestrial telescopes add an erecting lens (3-lens system) or use Porro prisms (as in binoculars) to invert the image again for an erect view.

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