Hi tha ks for your tutorial I'm building one. One question, you said fl must pass each other. Point E & O. By how much should it pass? Also why, what is the principle behind it. Thanks again
Hello again, on 0:37, you said that the focal point of the objective must pass the focal point of the eyepiece, but immediately after that you stated that the two focal points must be overlapped to form a telescope. I found that a bit confusing, a contradiction maybe? So the focal points of the two lens must overlap for object at infinity? Do we assume rays from object at infinity are parallel to each other when they hit the lens, but we do not assume they are parallel to the principle axis, correct?
Edoardo Franco Vianelli Yes, the image is upside down. The concept of the magnification can be considered as the absolute value (like in this example) or it can be considered as M = m1*m2 which would give you a negative answer.
Thanks for these video's, they really help me out! Do you have video's about entrance and exit pupil's? If not, do you know where i can find them? Thanks!
Are you sure the answer is in cm? I guess is mm. I have several telescopes and I use its a lot; however all the information is base on mm. Let's say one of my telescopes is 1000m, if I use and eye piece with 10mm this will be equal to 100mm or 100x. Here is how works: 1000mm/100mm= 100mm or M=100mm or M=100x. If I want to multiply this magnification power, I can use a Barlow eye piece. For example, a Barlow 3X. This Barlow could bring the following : 1000mm/10=100mmx3X(Barlow)= 300mm or 300x.This length used mm no cm.
I am a machinist...I need to observe/magnify my lathe and milling work without getting my head close to the work..I need to keep my head out of danger...I am looking for a long tube magnifier....A device I can quickly grab to observe the surface finish...How do I go about making this simple device...???....Thank You Very Much....Jeff
There are so many good product on the market to choose from, such as good magnifying glasses that are on swivel stands that clamp on, which are widely used around the world by assemblers etc.
Yes optical telescopes work on the principle presented, but there are a lot of different optical telescopes, and most of them are reflecting telescopes, where the objective lens is replaced by an objective mirror.
Really nice! I wish all my teachers had taught like that! Thank you.
Thank you very much Professor, this is very helpful.
You are welcome
This man singlehandedly saving my physics grade
Actually my wife does the bulk of the work, filming, editing, producing, and uploading the videos and she also makes all these amazing thumbnails. 🙂
That's awesome! Your videos are great. I'm mainly an audio learner so learning about optical instruments from you is helping a lot! All the best.
This is Great! Thanks for making the lecture video. It really helped a lot in my studies!
Great video! This was very helpful & easy to understand, keep up the good work
Hi tha ks for your tutorial I'm building one. One question, you said fl must pass each other. Point E & O. By how much should it pass? Also why, what is the principle behind it. Thanks again
How does tan #theta_E# = h/f? If we take f as adjacent side, clearly h is way smaller than the opposite side.
Hello again, on 0:37, you said that the focal point of the objective must pass the focal point of the eyepiece, but immediately after that you stated that the two focal points must be overlapped to form a telescope. I found that a bit confusing, a contradiction maybe? So the focal points of the two lens must overlap for object at infinity? Do we assume rays from object at infinity are parallel to each other when they hit the lens, but we do not assume they are parallel to the principle axis, correct?
Same thing, different words.
you're a lifesaver
how to calculate the focal length of a telescope ????
Shouldn't the magnification be negative as the image is inverted?
Edoardo Franco Vianelli Yes, the image is upside down.
The concept of the magnification can be considered as the absolute value (like in this example) or it can be considered as M = m1*m2 which would give you a negative answer.
Thanks for these video's, they really help me out! Do you have video's about entrance and exit pupil's? If not, do you know where i can find them? Thanks!
Can u explain this lesson of std9
thanks sir ...helped a lot
it helped me much
Are you sure the answer is in cm? I guess is mm. I have several telescopes and I use its a lot; however all the information is base on mm. Let's say one of my telescopes is 1000m, if I use and eye piece with 10mm this will be equal to 100mm or 100x. Here is how works: 1000mm/100mm= 100mm or M=100mm or M=100x. If I want to multiply this magnification power, I can use a Barlow eye piece. For example, a Barlow 3X. This Barlow could bring the following : 1000mm/10=100mmx3X(Barlow)= 300mm or 300x.This length used mm no cm.
Which answer are your referring to?
I am a machinist...I need to observe/magnify my lathe and milling work without getting my head close to the work..I need to keep my head out of danger...I am looking for a long tube magnifier....A device I can quickly grab to observe the surface finish...How do I go about making this simple device...???....Thank You Very Much....Jeff
There are so many good product on the market to choose from, such as good magnifying glasses that are on swivel stands that clamp on, which are widely used around the world by assemblers etc.
Is this how a optical telescope works?
I'm sorry, but I'm 12. I don't quite understand.
Yes optical telescopes work on the principle presented, but there are a lot of different optical telescopes, and most of them are reflecting telescopes, where the objective lens is replaced by an objective mirror.
Awosme !
👍
Why ist there a US flag? Ist that US physics only?