Telescope Buying Guide

Chiemeka Utazi Chichi asked:


Reflecting telescope makes use of a concave mirror in place of the objective lens to bring a distant object onto focus. What is the magnifying power of a telescope that has a mirror with 250cm radius and an eye piece, whose focal length is 5.0cm?

Teru Mikami asked:


This is for a project of ours. We’re supposed to make a simple telescope in our Physics class, is it possible to use a meniscus lens? How about two meniscus lenses? What are the effects? What kind of image is formed, an upright of inverted one?

Thank you.

blackberrydude117 asked:


A telescope with an objective lens that is converging and the eye piece is diverging. Would the diverging lens be inside the focal point etc?

Whee Moni~~ <3 (: asked:


A telescope produces an upside-down image. How can you change it so it won’t be upside-down?

Holli M asked:


How much more light does one collect with a 10-meter diameter telescope in 10 minutes than with a 1-meter diameter telescope in 100 minutes?

A. 1/10th as much
B. Same amount
C. 10 times as much
D. 100 times as much

ケィセィ asked:


How much more light does one collect with a 10-meter diameter telescope in 10 minutes than with a 1-meter diameter telescope in 100 minutes?
A. 1/10th as much
B. Same amount
C. 10 times as much
D. 100 times as much

water_skipper asked:


How does a telescope work different from a camera lense? I’m specifically wondering about magnification. With a camera lense, a longer lense means higher magnification so to get really high magnification it needs a really long lense. With a telescope they just change the eyepiece to get higher magnification and don’t change the length of the telescope.. How is it telescopes can change magnification like that and camera lenses can’t?

Palash asked:


how can i calculate the minimum & maximum magnification of a telescope? i need it to determine the distance of the nearest & the far object it can make a clear picture. with this information i can determine how much i can allow the lens to move. pls help.
I wanted to know what is the range of distance a specific telescope can focus clearly. ie. the distance of the nearest object it can focus & distance of the farest object it can focus. It’ll help me to calculate how much i should allow the lens to move.

puppy_53 asked:


Compare the function of the objective lens of a telescope with the objective of a
microscope. In each case, do you want a large focal length or small? Why? Where is your
object? Where and what kind of image is formed? Compare the function of the eyepiece
in both instruments. Do you want a large focal length or small? Why? Where is your
“object”? Where and what kind of image is formed?

Aquamarine Blue Beauty asked:


Compare the function of the objective lens of a telescope with the objective of a microscope. In each case, do you want a large focal length or small? Why? Where is your object? Where and what kind of image is formed? Compare the function of the eyepiece in both instruments. Do you want a large focal length or small? Why? Where is your ‘object’? Where and what kind of image is formed?