Register to reply

Increasing the resolving power of a telescope

by Idoubt
Tags: increasing, power, resolving, telescope
Share this thread:
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 Science news on
Experts defend operational earthquake forecasting, counter critiques
EU urged to convert TV frequencies to mobile broadband
Sierra Nevada freshwater runoff could drop 26 percent by 2100
Andy Resnick
Oct21-10, 11:34 AM
Sci Advisor
P: 5,528
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