According to diagrams like this schematic of refractive telescope - Wikipediathe answer is no, because every part of the objective lens gives the whole image. But when I cover part of the objective lens of my binocular, I only see part of what I see without covering. This shows that the answer to the above is yes.


1 Answer 1


You have to account for the distance of the object from the lens. For the objective of a telescope the object is very small so covering it won't affect visuality. But for a binocular, (which is used for short distance) the coverage would affect the visuality. Try yourself by covering your eyes and seeing a nearby object and far away star in night.

  • $\begingroup$ So binoculars work different than the diagram I posted? Everywhere I read that they work the same. $\endgroup$
    – George Lee
    May 14, 2020 at 18:36
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    $\begingroup$ @GeorgeLee No, it is the distance of the object from the lens. How far was the object (and, are you using just one side of the binocular?). photo.stackexchange.com might have an explanation. $\endgroup$ May 15, 2020 at 3:27
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    $\begingroup$ The ray diagram is similar but consider the distance. $\endgroup$
    – Guji2203
    May 19, 2020 at 7:41

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