Increasing the resolving power of a telescope

by Idoubt
Tags: increasing, power, resolving, telescope
Idoubt is offline
Oct21-10, 11:23 AM
P: 162
I have a toy telescope, very poor objective aperture like 30mm, the image is very poor.

I was wondering if I could increase it's resolving power by placing a convex lens with a larger aperture in front of the objective lens?

The larger lens should converge more light rays onto the objective giving more light.

I understand that the telescope is made for parallel rays but wont decreasing the distance to the eye piece compensate?
Phys.Org News Partner Astronomy news on
Computers beat brainpower when it comes to counting stars
The changing laws that determine how dust affects the light that reaches us from the stars
ESO image: A study in scarlet
Andy Resnick
Andy Resnick is offline
Oct21-10, 11:34 AM
Sci Advisor
P: 5,468
You are thinking mostly correctly, but the increased aberrations from doing what you suggest would likely degrade the image further.

What you really need is an increased numerical aperture (decreased f-number), and you are probably better off just getting a better telescope, rather than spending that time and money improving a poor quality instrument.

Register to reply

Related Discussions
about resolving power? General Physics 7
Resolving power on an inclined slope Introductory Physics Homework 3
Resolving Power Advanced Physics Homework 2
Resolving Power General Physics 2
Resolving Power Introductory Physics Homework 1