The image viewed in a telescope is a magnified virtual image. To achieve this, a telescope must have
A) a positive objective lens with a small focal length.
B) a positive eyepiece lens with a small focal length.
C) a negative objective lens with a large focal length.
D) a negative eyepiece lens with a large focal length.

Question

Quizplus · Accepted Answer

A telescope works by using two lenses, an objective lens and an eyepiece. The objective lens collects and focuses the light from the object being observed. This produces a real, inverted image at the focal point of the objective lens. The eyepiece then magnifies this image and makes it appear as if it were located at infinity, creating a virtual image that can be seen by the observer. To achieve a magnified virtual image, the eyepiece must have a small focal length and be positive. Therefore, the best choice is B.

The Image Viewed in a Telescope Is a Magnified Virtual